Flash player causes real problems on Youtube

Flash player causes real problems on Youtube site.
I don't really know if it's a Flash Player problem or a Youtube one but Youtube used to work fine back in like 3-4 months ago, now it doesn't anymore.
The issues I encounter with Flash player on Youtube are as follows:
First issue is the fact that after the video completely loads or it loads a big part of it then I click on the seek bar to jump at a specific time that has been already downloaded by the Flash player the video starts loading again from that point on like it didn't actually downloaded that part before. This issue causes big bandwith use since it downloads many many times the same portions of the clip that it has already loaded before dozens of time. If I play a 3 min music clip and click replay or point on the seek bar at the begining of the clip to play it again it loads/downloads the clip again and again and again. If the video clip has over 1 hour then I click play it might entirely load into the player in a few minutes then I click on the seek bar to skip at a certain point it starts loading again from that point on. This is the most anoying thing I encounter with Youtube lately.
Second issue is the fact that if I click on the seek bar of the player to skip to a specific time most of the time the playback does not start from that point on but it skips back to the last point where it was so I must click several times or keep the mouse button pressed for a long time on the same point in order to play from that place on. This one is again very anoying.
Third issue is that after the video starts playing in 360p it automatically changes to 720p after a minute or so even if I had checked this setting "I have a slow connection. Never play higher-quality video" in Youtube Playback Settings. I cleared the cookies and chosed several times the same "I have a slow connection. Never play higher-quality video" setting in Youtube Playback Settings but it just doesn't keep the settings on. This one is again very anoying since my computer can't handle well 720p.
I have reinstalled Win XP SP3 and even installed Win 7 SP1 tried several versions of Flash Player and several versions of Firefox, Chrome and Opera but the same issues occur everytime.
I haven't encounter any of these issues before like 3-4 months ago.

I have had problems trying to watch videos on youtube for the past couple of years. It's been almost unbearable, even if I set the resolution to 144kb! Then a few days ago, I went to youtube and couldn't watch at all. There was an error showing that my Flashplayer was out of date, and then a link to Firefox to get the right update. I did that two times to no avail. I had just installed the newest version of Flash Player as of November 2014, yet this error kept popping up. Finally, out of utter frustration, I did like you did, and uninstalled everything related to Adobe Flash. Then I went to youtube, just to see how bad the result would be, and suddenly videos started playing smoother, at higher resolution, and with faster buffering to start out. Sure, there are some videos that I can't play, and the newest iTunes seemed to have issues without having Flash, but videos aren't frustrating me like they had been on youtube.
So, yeah, I know what you're saying. I had the same solution work for me. Cheers.

Similar Messages

Flash Player causes Graphic card to crash then recover successfully on two identical systems.

Hello,
Ever since the latest update with Adobe Flash Player, I've been having problems with flash in general on my computer. My brother has the same exact computer and he also has this issue. I can uninstall Flash Player and the problem stops completely and the moment I install it again, the problem persists. I've looked just about everywhere and figured I'd post it on here for a solution.
The problem:
The graphic card crashes and then recovers successfully when using Flash Player in general (happens most of the time when listening to a playlist on youtube and when the webpage is loading/changing to the next song). It also causes blue squares to appear on my monitor in random places. Flash videos become disturted and appear as blocks of fuzzy colors representing what they should really be when in full screen watching the video.
Troubleshot to conclude it was Flash Player:
I did extensive research and troubleshooting on my end, the problem started when I updated flash player with the auto-updater. I bench-marked my computer with running multiple programs and games to the maximum effort my computer could handle without flash installed (needless to say, no problem occurred). I then installed flash according to specs and ran a youtube playlist alone on Internet Explorer, the problem did occur. I then tried it with FireFox and Google Chrome, the same problem occurred.
I had my brother reformat his computer and install everything according to spec (all of his drivers are up to date as well) and the problem persisted with his end so I haven't done that, since it'd be to no avail.
I have even uninstalled Flash Player using the uninstaller executable that's supposed to remove everything from Flash Player and tried to install the version that worked prior to the update and it's as if something from Flash isn't being removed because the problem happens with the old version too as well.
Our computer specs are as follows:
Manufacturer: CyberPower, Inc.
Processor: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
Memory(RAM): 3.00GB
System Type: 64-bit Operating System
Operating System: Windows Vista Home Premium Service Pack 2
Graphic Card: ATI Radeon HD 4800 Series (Actual card is ATI Radeon 4850)
If I should post something else, let me know and I will. This problem is kind of annoying to be honest so any help would be greatly appreciated. Thanks for your time and assistance.

Hello,
Sadly this does not fix the problem on either computer. The video still comes in distorted while watching videos and the graphic card still crashes on song change while listening to a youtube playlist. The drivers are updated on both computers. As stated, this started happening when auto-updating to the latest version of Adobe Flash Player from the system tray icon. I can't even un-install flash and revert back to the version that worked before this update since it's as if something from Flash Player doesn't get uninstalled when using the uninstaller because the problem happens on all versions of Adobe Flash Player that I've tried. Thanks for your time and assistance.

After installing Flash Player, I lost sound on Youtube and other sites. How do I fix it?

After installing Flash Player, I lost sound on Youtube and other sites. How do I fix it? I still have sound on some apps.

To help troubleshoot we'll need the following system information:
Operating   system
Browser
Flash   Player version
When reporting issues with video or audio, it's also helpful to get your system hardware and driver details. Instructions for finding this information can be found here:
Windows
Mac
Finally, sometimes video and audio problems are caused at a lower level and not directly related to Flash Player. I recommend trying both of the links below to see how they perform. If the problem exists with both, then Flash Player is most likely not the culprit as the HTML5 video link does not use Flash Player when playing. You can verify the use of HTML5 by right clicking the HTML5 video and looking for the words "About HTML5" at the bottom of the context menu.
HTML5   video
Non-HTML5 video
Thanks,
Chris

On 12/23/11 I update the adobe flash player and have had problems since- unexpected closing and freezing. Remove the adobe flash player and those problems resolved. How do I go back to the earlier version of adobe?

I was prompted by Firefox to update my adobe flash player on 12/23/11, which I did. Ever since then the web site has frozen and/or crashed. I run a internet business and can't have this continue. I uninstalled the flash player and the problems have stopped. I would like to reinstall the earlier version of adobe, since that didn't seem to impact the web site.
This is the flash player I installed on the 23rd - Flash Player 10.3 for Mac OS X 10.4-10.5 (Intel)

Your above posted list of installed plugins doesn't show the Flash plugin for Firefox.<br />
See [[Managing the Flash plugin]] and [[Installing the Flash plugin]]
You can check the Adobe welcome and test page: http://www.adobe.com/software/flash/about/
You can use this manual download link:
*http://kb2.adobe.com/cps/191/tn_19166.html#main_ManualInstaller

Flash Player causes browsers crash.

Hi, I'm sorry for my bad English. I have a problem with my Mac. *After the upgrade from 10.6 to 10.6.6*, using *all browsers* I can't view webpages with Flash content because *the browsers crash*. The problem is due to the *Flash Player* software. I tried to install the latest version of the browsers and Flash Player, but the problem isn't resolved. Can you help me to fix this problem? Thank you.

Uninstall Flash using the appropriate uninstaller for whichever version of Flash you have installed. Then do the following:
Repair the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
Download the 10.6.6 Combo Updater and reinstall it.
If this doesn't fix the problem then you will have to reinstall Snow Leopard using the installer DVD. This *will not* erase your drive or your files.

Adobe Flash Player with Safari problem

Youtube says that I need to upgrade my Adobe Flash Player when I have already done so. It also says this on multiple sites where I can watch flash content as well. What do I need to do?

Make sure you are using the correct version of Flash Player.
The latest version of Adobe FlashPlayer can be obtained from here:
http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFl ash
You can check here: http://www.adobe.com/products/flash/about/ to see which version you should install for your Mac and OS. Note that version 10,1,102,64 is the last version available to PPC Mac users*. The latest version, 10.2.152.25 or later, is for Intel Macs only, as Adobe no longer support the PPC platform. Note that the latest Flash Player update only works on YouTube with Safari in 32 bit mode - until YouTube correct this.
* Unhelpfully, if you want the last version for PPC Macs, you need to go here: http://kb2.adobe.com/cps/142/tn_14266.html and scroll down to 'Archived Versions/Older Archives'. The first one on the list, Flash Player 10.1 is the one you download. More information here: http://kb2.adobe.com/cps/838/cpsid_83808.html
You should first uninstall any previous version of Flash Player, using the uninstaller from here (make sure you use the correct one!):
http://kb2.adobe.com/cps/865/cpsid_86551.html#prob1=uninst,os=m10.6,
and also that you follow the instructions closely, such as closing ALL applications first before installing. You must also carry out a permission repair after installing anything from Adobe.

Flash player causing internet explorer 7 to crash

Flash player is causing internet explorer 7.0 to crash. Using
windows vista, brand new laptop. Many times while online, internet
will close and give error message that Flash player caused internet
to close. Have read everywhere and tried everything. Adobe doesnt
seem to want to help and i am getting tired of flash player causing
me to loose everything working on while online. If anyone has any
suggestions, please help!!! Thanks

You need to close all iexplore.exe processes; use the Task Manager's Processes tab.

How do i get the adobe flash player so i can watch youtube videos?

how do i get the adobe flash player so i can watch youtube videos?

Software is always safest directly from the developer or the App Store.
There are numerous untrustworthy 'update' sites like Cnet & Softonic, & many users won't know that one is to be trusted (so far) but not most of the others.
Adobe make Flash Player : get it from Adobe.

Flash Player 7 was working on Youtube, now it's not?

Hi Everyone
Just a few days ago Flash Player 7 was working on
Youtube. Now it is not. My Javascript was enabled,
unless I checked in the wrong spot. Also it told me
to uninstall Flash Player 7 and re-install it. I tried
to open the uninstaller with Stuffit Expander but it did
not work. I read in an earlier forum that some sites no
longer support Flash Player 7.
Could someone please tell me if it's possible for me to
get back on Youtube as I am missing the music videos.
I am on OS9.1 and I am using IE 5.1
Thank you for all of your help in advance.
Sincerely,
Rudzinka

It's possible you may need to update to IE v5.1.7.
Internet Explorer (Classic) 5.1.7
Internet Explorer 5.1.7
Internet Explorer v5.1.7
"WARNING:" Microsoft ended support for Internet Explorer for Mac on December 31st, 2005, and is not providing any further security or performance updates.
Accordingly, as of January 31st, 2006, Internet Explorer for the Mac is no longer available for download from Microsoft.
If you still are unable to get YouTube to work, then you may have no alternativer but to watch YouTube on another browser.
Mozilla v1.3.1(Wamcom)
Netscape Browser Archive
Netscape v7.0.2
MacUpdate-NC v7.0.2
iCab v3
Opera v6.0.3
WannaBe (Text only browser)
MacLynx (Text only browser)

I have a problem with FF 4.0b8 and Adobe Flash player where portions of the YouTube page or FF window will black out when I move my curser over buttons or tabs, etc. Any suggestions?

I'm running FF 4 Beta 8 with the latest Flash player (10.1.102.64). When I play YouTube videos, the video is loaded, starts, and plays okay, but when I move my cursor around within the Firefox window, portions of the window black out under where the cursor travels. FF tabs and buttons will black out, or parts of the YouTube page (but not the video). CTL-ALT-Del to bring up Windows Security Panel, then CANCEL will restore the Firefox window, plus the YouTube page correctly (ie black is gone and window has been redrawn correctly). I can open up new tabs and replicate the problem multiple times. I've also experienced this problem with embedded YouTube videos (though it's easiest to replicate the problem direct from the YouTube page.) I don't experience this problem at all with FF 4 Beta 8 in Safe Mode, nor the latest FF 3.x.x. I have tried uninstalling and re-installing the Flash plug-in. Anyone have any ideas?

Problem involving videos played from the YouTube site is much less noticeable after upgrading from FF 4.0b8 to 4.0b9, but still occurs with embedded YouTube videos, where blacking out of other portions of the window still happens.

Flash player causing blue screen upon loading video

Hello,
I have recently bought a new system. Everything runs perfectly except for one critical problem; I can't view flash videos or anything played in a web browser by flash player.
Animated flash advertisements will load to the first couple of frames, I will hear a bit of noise and then a brief 1-2 second system hang and straight in to a bluescreen. Same goes for youtube etc, might see a frame, if that, a brief noise and hang/bluescreen. This has occurred since I have purchased the PC.
I have attempted to fix the problem by updating my graphics drivers to the latest, updating flash player to the latest, updating sound drivers to the latest.
System:
AMD i5 750
ATI Radeon 5870
Realtek audio
Windows 7 Professional 32-bit
Mozilla Firefox 3.6.6 -------------> Flash player 10.1
I am just viewing the bluescreen dump file, there is no bug check string, however it seems to indicate an AMD/graphics driver causing the conflict.
070610-31621-01.dmp
6/07/2010 10:19:36 PM
0x00000116
0x85e1e2c0
0x924145e6
0x00000000
0x00000002
atikmpag.sys
atikmpag.sys+55e6
AMD multi-vendor Miniport Driver
AMD driver
Advanced Micro Devices, Inc.
8.14.01.6117
32-bit
C:\Windows\Minidump\070610-31621-01.dmp
4
15
7600
There are 7 bluescreen dumps on the minidump file, they are all identical to the above.
These are the lines highlighted in red from BlueScreenView:
Filename
Address In Stack
From Address
To Address
Size
Time Stamp
Time String
Product Name
File Description
File Version
Company
Full Path
atikmpag.sys
atikmpag.sys+55e6
0x92060000
0x92098000
0x00038000
0x4bfe9cef
28/05/2010 2:25:19 AM
AMD driver
AMD multi-vendor Miniport Driver
8.14.01.6117
Advanced Micro Devices, Inc.
C:\Windows\system32\drivers\atikmpag.sys
dxgkrnl.sys
dxgkrnl.sys+8cadb
0x92098000
0x9214f000
0x000b7000
0x4ac54de1
2/10/2009 10:48:33 AM
Microsoft® Windows® Operating System
DirectX Graphics Kernel
6.1.7600.16432 (win7_gdr.091001-1312)
Microsoft Corporation
C:\Windows\system32\drivers\dxgkrnl.sys
dxgmms1.sys
dxgmms1.sys+692c
0x92bb6000
0x92bef000
0x00039000
0x4a5bc265
14/07/2009 9:25:25 AM
Microsoft® Windows® Operating System
DirectX Graphics MMS
6.1.7600.16385 (win7_rtm.090713-1255)
Microsoft Corporation
C:\Windows\system32\drivers\dxgmms1.sys
watchdog.sys
watchdog.sys+107e
0x8cfe4000
0x8cff1000
0x0000d000
0x4a5bc21a
14/07/2009 9:24:10 AM
Microsoft® Windows® Operating System
Watchdog Driver
6.1.7600.16385 (win7_rtm.090713-1255)
Microsoft Corporation
C:\Windows\system32\drivers\watchdog.sys
System
Provider
[ Name ]
EventLog
EventID
6008
[ Qualifiers ]
32768
Level
2
Task
0
Keywords
0x80000000000000
TimeCreated
[ SystemTime ]
2010-07-06T12:19:26.000000000Z
EventRecordID
3580
Channel
System
Computer
Owner-PC
Security
EventData
10:17:22 PM
6/07/2010
2955
DA07070002000600160011001600C003DA070700020006000C0011001600C003600900003C0000000100000060 09000000000000B00400000100000000000000
System
Provider
[ Name ]
Microsoft-Windows-Kernel-Power
[ Guid ]
{331C3B3A-2005-44C2-AC5E-77220C37D6B4}
EventID
41
Version
2
Level
1
Task
63
Opcode
0
Keywords
0x8000000000000002
TimeCreated
[ SystemTime ]
2010-07-06T12:19:06.042422100Z
EventRecordID
3584
Correlation
Execution
[ ProcessID ]
4
[ ThreadID ]
8
Channel
System
Computer
Owner-PC
Security
[ UserID ]
S-1-5-18
EventData
BugcheckCode
278
BugcheckParameter1
0x85e1e2c0
BugcheckParameter2
0x924145e6
BugcheckParameter3
0x0
BugcheckParameter4
0x2
SleepInProgress
false
PowerButtonTimestamp
0
The computer has rebooted from a bugcheck. The bugcheck was: 0x00000116 (0x85e1e2c0, 0x924145e6, 0x00000000, 0x00000002). A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 070610-31621-01.
I don't know if it is Flash player particularly causing the problem, or if there is a conflict between it and some hardware.
So, can anyone help?

i'm having the same problem as the OP,
System:
Intel Q6600
ATI Radeon 4850 (drivers v10.9)
Realtek audio
Windows vista home premium 32-bit (auto-updates)
Chrome 6 & ie8 Flash player 10.1
my BSOD returned the error code: 0x00000116 (0x8505F150, 0x8F1E98B0, 0x00000000, 0x00000002)
atikmpag.sys - Address 8F1E98B0 base at 8F1E4000, datestamp today
it started before last summer, it doesn't happen often but lets just say its making me rather nervous to use youtube and other sites that use flash now.
i've read allot of people have this problem and have traced it to using flash. i hope somebody at adobe is listening and not trying to blame hardware makers or drivers about this problem.
i disabled hardware acceleration, i hope this does the trick until a real fix can be found
btw if any flash animation gives a BSOD how else could we turn it off ? Think about it for a second people

Safari 4.0.3 + Flash Player Hang SBBOD Problem.

Hi, I feel like this is a bit redundant, but I've been skimming through the forums trying to figure out the answer to my problem.
My Safari was updated to 4.0.3 recently (earlier today, I believe), and now when I try to visit any site with flash-based content (youtube, certain news sites, etc.), Safari starts to hang and I have to do a "force quit". I followed instructions and was able to figure out that the Flash player plug-in caused the hanging/crashing problem.
As far as I know, I have the latest updated plug-ins. Also, I don't have any other plug-ins installed besides the default ones (my MBP is fairly new, I got it around 2 weeks ago. This is very annoying, considering that Safari was working just fine 8 hours ago (since I was still able to view flash-based websites without the hang problem).
Right now I've disabled plug-ins to avoid the hang, but it's really a nuisance and I can't figure out why the problem is happening. My best guess is that it has to do with my updating Safari from 4.0.2 to 4.0.3, but I'm no tech guru.
I'd really appreciate the help! I'm posting my latest crash report in the post below!

edit: I decided to reboot my machine just in case and now Safari is working just fine. If it hangs again I'll edit this post...
Message was edited by: roboslant

Flash player causes IE7 to crash

I use Win XP Home with SP2 and IE7, on a 2 week old PC (so
both were OEM loaded).
I have installed Flash Player in order to get a decent
experience from websites.
On one site - and one site only - anything from 15 to 120
seconds after the home page has loaded, I get a message that "IE
has encountered a problem and needs to close". By sending an error
report to M/Soft and then getting the message box with a 'More
Information' option, every time this says that it is Flash Player
that has caused the crash.
I am directed to the Macromedia/Adobe site to update Falsh -
but I already have the latest verison installed. My version in the
Windows/System32/Macromedia/Flash directory is Flash9e.ocx.
Based on tips seen elsewhere, I have even added a copy of
this in the same directory and renamed it as Flash.ocx.
Further more, I have uninstalled (using the Adobe/Macromedia
special uninstaller) and then re-installed (every time downloading
a new copy of Flash from Adobe and/or Macromedia) at least 6 times
in the last 10 days, each installation being clean, with no
programmes running and no anti-virus or anti-spyware software
running at all.
This is driving me absoutely potty, as no-one can offer any
help - not Adobe e-mail Technical Support, not MIcrosoft, not the
PC supplier, not the wesbite where the problem is, no-one.
Yet it is a real problem but no-one is prepared to take
ownership of it.
Has anyone in the communities got any ideas as to how to
solve this?
Many thanks
bolehill
PS: Neither Flash nor IE7 were upgrade installations - they
were installed as new.

quote:
Originally posted by:
bolehill
Hi ******
Well, it looks like I have fixed the problem too, but not
quite in the same way as you did - although what you suggested led
me there eventually.
Having read your message, I downloaded the Device Cleaner
software and then read the ReadMe file that came with it. I don't
have either NTI or nvidia drivers for my graphics card, but I have
an Intel Express Chipset.
So on reading the file, I just wondered if my Display Adapter
driver needing updating, so I went via My Computer; Mange; Device
Manager; expanded the Display Adapter and right clicked the
resulting driver. From this menu, I went to Properties and then the
Driver tab of this. I then selected Update Driver and let Windows
do its stuff, allowing it to search for an updated driver. Hey
presto, it found one somewhere on the system (it definitley did not
go to the Internet), and, having rebooted after the driver update
(as required by the system), I can now access the website that
caused the problems without IE7 closing straight away.
So it appears that the iesue is around a conflict between the
main dispaly adapter drivers and Flash and the way round this is to
make sure that the display adapter driver is 110% up-to-date (and
in your case, also that there is no trace left of the old driver).
Maybe this will help others....?
Cheers
Bolehill
Thanks, bolehill. My friend was having the same problem and
pointed her to this thread. Says I was a miracle worker but told
her I was just a good researcher. You did all the job. Thanks.

Flash player does not work in youtube

When ever I go to youtube I get this message "You need to upgrade your Adobe Flash Player to watch this video. " and most videos will not play. I click on the link underneath saying "Download it from Adobe."
It takes me to http://get.adobe.com/flashplayer/ where It says the following:
Version 12.0.0.77
Your system:
Windows 64-bit , English, Firefox
I click to install and go through the install process.
When I try youtube I get the same message, problem remains.
I have checked javascript is enabled. I do have IE also on this computer and I noticed last time I tried this process it opened IE after finishing.
Many thanks for any help.
My system:
Windows 8.1, firefox version 28.0

Note that both IE (ActiveX) and Google Chrome (Pepper) come with their own versions of Flash that are developed by Adobe in cooperation with the developers of those browsers to get the best performance.
Firefox uses a different (NPAPI) Flash plugin than IE (ActiveX), so make sure to install the Flash Player plugin for Firefox.<br />
Your above posted list of installed plugins doesn't show the Flash plugin for Firefox.

Flash Player linux, grey box issue (youtube vids and some applets do not display)

I posted this question on my distro-specific forum as well as linuxquestions.org, however it appears to be a unique problem, so here it is:
When viewing videos on youtube.com, most other websites, and when trying to run certain flash games, the flash applet will not display (though the audio will play). Instead of displaying the flash applet, there will be a grey box where the flash video or applet would normally be.
This problem occurs on Firefox and Chromium, but not on Opera.
My Specs are as follows:
Distro: PCLinuxOS 2010 (32-bit)
flash-player-plugin: 10.1-2pclos2010
firefox: 3.6.6-1pclos2010
swfdec has never been installed (to my knowledge)
I did a lot of investigating about the problem but have turned up no solutions thus far. Here are my results.
Flash videos and applets which allow access to the settings menu (like youtube played from their website) do not display, however flash videos and applets which do NOT allow access to the settings menu (including youtube videos embedded in other websites) WILL display.
Reinstalling flash-player-plugin and firefox through synaptic does not solve the problem (though note that PCLOS works with rpm files, not deb files. apt4rpm does not support the remove --purge operation, however reinstalls are said to overwrite custom configs with stock ones.)
Creating a new firefox profile and/or starting FFox in safe-mode does not solve the problem
Creating another user and running FFox from that user will properly display flash videos
Comparing default plugins between my main user and new user shows that there is no difference. So this likely rules out a defective extension or plugin binary.
Deleting ~/tmp/plugtmp* folders when FFox is closed does not solve the problem.
Removing the ~/.macromedia and ~/.adobe folders does not solve the problem. (have checked permissions between the new test user and main user, and they are equivalent)
Downloading libflashplayer.so from the Adobe website and copying it to /usr/lib/mozilla/plugins has no effect on the problem.
I'm thinking that there might be somewhere else that flash stores configurations for my user, and that maybe the settings there are corrupted and would need to be purged. However frantic googling has turned up nothing useful so far.
Does anyone have any suggestions for me?

The problem, at least in my case, was QtCurve's opacity. If I have opacity set to less than 100%, flash would not display for sites like Youtube and Vimeo, but worked elsewhere.
The solution for me was to go into qtcurve's settings, and put npviewer.bin in the application exceptions section for window and menu opacity. Doing that, I was able to keep my transparent menus, and also use flash everywhere.
You can find out what the application name is by launching your browser of choice in a terminal with qtcurve debug turned on, like so:
QTCURVE_DEBUG=1 firefox
If you watch through the lines that start with "QtCurve" you'll see "Application name". Look for the one that shows up when you try to load a video. In my case it was npviewer.bin. In yours, it might be nspluginviewer or something else. If you add an exception for that specific application, you'll fix your problem without having to compromise on your theme.

Flash player causes real problems on Youtube

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