Flash does not work on youtube after update

Question

I use Firefox on Fedora 14 x86_64. I do not have the 32-bit applications or libraries installed. I have been having the problem for a while. I saw it with FF 3.6.14, FF 3.6.15, and FF 4 beta. I do not know if this is specifically a FF issue. Firefox operates the Adobe flash module with NS Wrapper and the problem seem to be with NS Wrapper. I do not know how the FF and the NS Wrapper projects are related.
The problem is that 90% of the time FF fails to startup the video player plugin when I visit a page with video. It plays normally once it starts but usually it just doesn't start. When it happens, there are usually no graphics drawn for the video object (no black box, no thumbnail, no video player gadget, just a big empty space). When I run from a terminal then I get the error messages listed below.
I am using the recent 64-bit flash release. flashplayer10_2_p3_64bit_linux_111710. This worked before and it works with the Konqueror browser.
software:
nspluginwrapper.x86_64 1.3.0-15.fc14
firefox.x86_64 3.6.15-1.fc14
firefox4.x86_64 4.0-0.13.b11.fc14
glibc.x86_64 2.13-1
kernel.x86_64 2.6.35.11-83.fc14
errors:
*** NSPlugin Wrapper *** ERROR: NPP_GetValue() wait for reply: Message timeout
*** NSPlugin Wrapper *** WARNING:(../src/npw-wrapper.c:1927):invoke_NPP_SetWindow: assertion failed: (rpc_method_invoke_possible(plugin->connection))
*** NSPlugin Wrapper *** WARNING:(../src/npw-wrapper.c:1858):invoke_NPP_Destroy: assertion failed: (rpc_method_invoke_possible(plugin->connection))
*** NSPlugin Wrapper *** ERROR: NPObject 0x7f12e96c3920 is no longer valid!
*** NSPlugin Wrapper *** WARNING:(../src/npw-wrapper.c:2167):invoke_NPP_NewStream: assertion failed: (rpc_method_invoke_possible(plugin->connection))
*** NSPlugin Wrapper *** WARNING:(../src/npw-wrapper.c:1927):invoke_NPP_SetWindow: assertion failed: (rpc_method_invoke_possible(plugin->connection))

Answer 1

Flash plugin crashes every time it loads.
Flash works fine here on Firefox and Safari (actually 10.6 users shouldn't be using Safari as Apple doesn't support it anymore)
You said you reinstalled OS X, but that only does OS X unless you first wiped the drive of all users (and their data!) and programs.
So your issue is likely a corrupted Flash user cache file or user permissions issue in your user account.
Since you uninstalled and reinstalled Flash and the problem continues, that would suggest it's the cause.
It can likely be confirmed by logging into another user account.
You can delete your Flash cache file in the Apple menu > System Preferences also use the OnyX routine in the Step by Step fixes should clear other cache issues.
Also run through this list of fixes to eliminate other issues (like failed user account permissions) as you generally tune up your machine.
..Step by Step to fix your Mac
How to install/uninstall Flash, fix problems
https://discussions.apple.com/community/notebooks/macbook_pro?view=documents#/?p er_page=50
Worst case scenario you could move your data to a new user account.
Combine two+ Users Accounts on the same machine