Preview application won't open anything

Why won't preview open anything? No jpgs, no pdfs. nothing.

Tom, I agree that the permissions on a tmp folder are messed up, had not seen that particular command before, sounds pretty nifty. I had a similar sort of problem on my Leopard upgrade install, where a tmp directory used by TextEdit (among others) was causing all new files to be saved with the group "unknown" (the Finder's desperate attempt to make of sense of the Tiger private group, which the tmp folder was stuck with). For me that was the final straw and I did an erase and install of Leopard (I had spent several days trying to straighten out the group inconsistencies at that point). I presume you would rather not do that! By all means try the sudo command.
Tim, try disconnecting everything from your machine that didn't come from Apple, then do a Safe Boot (hold down the Shift key when you hear the chime). If you do it correctly the boot will take considerably longer as the system runs a disk repair, empties some caches, and disables everything not strictly necessary for the computer to run. Try Preview again and see what happens. If it still isn't working properly, quit it. Launch Disk Utility and run Repair Permissions (just for luck, but you never know--it sometimes actually fixes something useful). Then re-apply the 10.5.2 update--be sure to download the COMBO version from Apple and use that. After the restarts try Preview again. Something is definitely wrong with the way your system is working.
Francine
Francine
Schwieder

Similar Messages

Preview application won't open - "1712"

My Preview application on my mac book pro (Lion OS X) won't open any pdf or jpeg documents. It just says ' the application Preview can't be opened. -1712'
I tried deleting the Preview.plist file as recommended in a previous discussion but the application still won't open.
Any other suggestions?

Restart. If an application won't quit and prevents restarting, select
 ▹ Force Quit...
from the menu bar, then select the frozen application from the list and press return. As a last resort, force a shutdown by holding down the power button for a few seconds. Then press it again briefly to start up. Test.

Preview Application won't open any documents.

My Preview application on my mac book pro (Lion OS X) won't open any pdf or jpeg documents. It just says ' the application Preview can't be opened. -1712'
How can I fix this?

Go to your Finder "Go" menu hold the option key to choose "Library". Then go to Preferences/com.apple.Preview.plist and delete that file. Relaunch Preview.

Problem description: My MacBook Pro is running really slow. Applications won't open or take up to 10 min. EtreCheck version: 2.1.5 (108) Report generated December 27, 2014 at 9:15:58 PM CST Click the [Support] links for help with non-Apple products

Problem description:
My MacBook Pro is running really slow. Applications won’t open or take up to 10 min.
EtreCheck version: 2.1.5 (108)
Report generated December 27, 2014 at 9:15:58 PM CST
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
Hardware Information: ℹ️
MacBook Pro (13-inch, Late 2011) (Verified)
MacBook Pro - model: MacBookPro8,1
1 2.4 GHz Intel Core i5 CPU: 2-core
4 GB RAM Upgradeable
BANK 0/DIMM0
2 GB DDR3 1333 MHz ok
BANK 1/DIMM0
2 GB DDR3 1333 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
Intel HD Graphics 3000 - VRAM: 384 MB
Color LCD 1280 x 800
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: one day 6:55:8
Disk Information: ℹ️
TOSHIBA MK5065GSXF disk0 : (500.11 GB)
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
HD (disk1) / [Startup]: 498.88 GB (5.04 GB free) (Low!)
Core Storage: disk0s2 499.25 GB Online
MATSHITADVD-R   UJ-8A8
USB Information: ℹ️
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/System/Library/Extensions
[loaded] com.epson.driver.EPSONProjectorUDAudio (1.30 - SDK 10.4) [Support]
[not loaded] com.seagate.driver.PowSecDriverCore (5.2.6 - SDK 10.4) [Support]
/System/Library/Extensions/Seagate Storage Driver.kext/Contents/PlugIns
[not loaded] com.seagate.driver.PowSecLeafDriver_10_4 (5.2.6 - SDK 10.4) [Support]
[not loaded] com.seagate.driver.PowSecLeafDriver_10_5 (5.2.6 - SDK 10.5) [Support]
[not loaded] com.seagate.driver.SeagateDriveIcons (5.2.6 - SDK 10.4) [Support]
Problem System Launch Agents: ℹ️
[killed] com.apple.CallHistoryPluginHelper.plist
[killed] com.apple.coreservices.appleid.authentication.plist
[killed] com.apple.icloud.fmfd.plist
[killed] com.apple.telephonyutilities.callservicesd.plist
4 processes killed due to memory pressure
Problem System Launch Daemons: ℹ️
[killed] com.apple.ctkd.plist
[killed] com.apple.icloud.findmydeviced.plist
[killed] com.apple.ifdreader.plist
[killed] com.apple.nehelper.plist
[killed] com.apple.wdhelper.plist
[running] com.seagate.TBDecorator.plist [Support]
5 processes killed due to memory pressure
Launch Agents: ℹ️
[not loaded] com.adobe.AAM.Updater-1.0.plist [Support]
[loaded] com.carbonite.launchd.carbonitealerts.plist [Support]
[running] com.carbonite.launchd.carbonitestatus.plist [Support]
[loaded] com.coupons.coupond.plist [Support]
[loaded] com.hp.help.tocgenerator.plist [Support]
[loaded] com.trendmicro.itis.dca.plist [Support]
[running] com.trendmicro.itis.uimgmt.agent.plist [Support]
Launch Daemons: ℹ️
[failed] com.adobe.fpsaud.plist [Support]
[running] com.carbonite.launchd.carbonitedaemon.plist [Support]
[loaded] com.microsoft.office.licensing.helper.plist [Support]
[running] com.trendmicro.icore.av.plist [Support]
[running] com.trendmicro.icore.main.plist [Support]
[running] com.trendmicro.icore.wp.plist [Support]
[running] com.trendmicro.itis.plugin.plist [Support]
User Launch Agents: ℹ️
[loaded] com.adobe.AAM.Updater-1.0.plist [Support]
[loaded] com.google.keystone.agent.plist [Support]
[invalid?] com.jdibackup.JustCloud.autostart.plist [Support]
[invalid?] com.jdibackup.JustCloud.backupstart.plist [Support]
[loaded] com.trendmicro.itis.uninstaller.plist [Support]
User Login Items: ℹ️
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
bomgar-scc-20130819-104735 UNKNOWN (missing value)
bomgar-scc-20130905-143949 UNKNOWN (missing value)
USB Display Agent Application (/Applications/USB Display/USB Display.app/Contents/Resources/USB Display Agent.app)
WDDriveUtilityHelper Application (/Applications/WD Drive Utilities.app/Contents/Resources/WDDriveUtilityHelper.app)
WDSecurityHelper Application (/Applications/WD Security.app/Contents/Resources/WDSecurityHelper.app)
USB Display Agent Application (/Applications/USB Display/USB Display.app/Contents/Resources/USB Display Agent.app)
bomgar-scc-20130819-104735 UNKNOWN (missing value)
bomgar-scc-20130905-143949 UNKNOWN (missing value)
HP Scheduler Application (/Library/Application Support/Hewlett-Packard/Software Update/HP Scheduler.app)
HP Product Research Application (/Library/Application Support/Hewlett-Packard/Customer Participation/HP Product Research.app)
Internet Plug-ins: ℹ️
SharePointBrowserPlugin: Version: 14.4.7 - SDK 10.6 [Support]
FlashPlayer-10.6: Version: 15.0.0.223 - SDK 10.6 [Support]
CouponPrinter-FireFox_v2: Version: 5.0.5 - SDK 10.6 [Support]
Flash Player: Version: 15.0.0.223 - SDK 10.6 Mismatch! Adobe recommends 16.0.0.235
QuickTime Plugin: Version: 7.7.3
Default Browser: Version: 600 - SDK 10.10
User internet Plug-ins: ℹ️
npBcsMcTcIO: Version: Unknown [Support]
Safari Extensions: ℹ️
Trend Micro Toolbar [Installed]
3rd Party Preference Panes: ℹ️
Carbonite [Support]
Flash Player [Support]
Paragon NTFS for Mac ® OS X [Support]
Seagate Dashboard for Mac OSX [Support]
Time Machine: ℹ️
Skip System Files: NO
Mobile backups: ON
Auto backup: YES
Volumes being backed up:
HD: Disk size: 498.88 GB Disk used: 493.84 GB
Destinations:
Jens Seagate Backup [Local]
Total size: 999.86 GB
Total number of backups: 6
Oldest backup: 2014-06-24 10:33:56 +0000
Last backup: 2014-12-17 17:14:18 +0000
Size of backup disk: Too small
Backup size 999.86 GB < (Disk used 493.84 GB X 3)
My Passport for Mac [Local]
Total size: 2.00 TB
Total number of backups: 14
Oldest backup: 2013-08-21 19:19:35 +0000
Last backup: 2014-12-19 11:44:23 +0000
Size of backup disk: Excellent
Backup size 2.00 TB > (Disk size 498.88 GB X 3)
Top Processes by CPU: ℹ️
      6% coreaudiod
      5% CarboniteDaemon
      4% iMovie
      3% JustCloud
      3% Wondershare Player
Top Processes by Memory: ℹ️
335 MB iPhoto Library Manager
180 MB Finder
142 MB iMovie
70 MB Preview
51 MB Microsoft Word
Virtual Memory Information: ℹ️
149 MB Free RAM
1.04 GB Active RAM
897 MB Inactive RAM
1.17 GB Wired RAM
30.53 GB Page-ins
1.42 GB Page-outs
Diagnostics Information: ℹ️
Dec 26, 2014, 05:17:12 PM /Library/Logs/DiagnosticReports/iPhoto_2014-12-26-171712_[redacted].cpu_resourc e.diag [Details]
Dec 26, 2014, 03:47:17 PM /Library/Logs/DiagnosticReports/CarboniteDaemon_2014-12-26-154717_[redacted].cp u_resource.diag [Details]
Dec 26, 2014, 02:22:01 PM Self test - passed
Dec 26, 2014, 11:48:03 AM /Library/Logs/DiagnosticReports/CarboniteDaemon_2014-12-26-114803_[redacted].cp u_resource.diag [Details]

You have nearly run out of disk space. Either purchase a larger one or start cleaning out the one you have?

Applications won't open, among other things

My MacBook is falling apart...first the wireless stops working (similarly to others), then the backlight goes out, and now my applications have gone haywire...
First, I tried to install the iTunes 9.0.2 update and the install failed and corrupted my iTunes so that it no longer works (I have this posted on another thread). I have tried to redownload and install multiple times and it tells me there is an error in the install. The I tried to install it again from the software update, along with a system update and both had errors installing. I tried doing them separately and they still wouldn't work. This was last Thursday. I was put of town and didn't use my MacBook until today, but when I turned it on, I discovered that half my applications won't open -- mail, safari, iChat, adium, picasa, to name a few. The software update won't open from the pull down menu, but I can get to it from the system preferences.
Also, now it tells me there are no updates, when the two that failed should still show up.
There actually seems to be something wrong with the installer in general too, as now anything I try to install gives me an error...
Any ideas???
Macbook core duo, late 2006, os 10.4.11

try updating your OS for a start. Many fixes have been done since 10.4.11

Some applications won't open after updating to OS 10.8.5

I am running the Mountain Lion on a 2009 Macbook Air. I just did an update to 10.8.5 and now some of my applications won't open. A few of the appications that no longer run are Chrome, iPhoto and all Microsoft applications.
I tried uninstalling an reinstalling the apps but that did nothing, I also tried creating a new user account to see if the problem persisted in there and it did. I then tried removing my caches folder from Library which also fixed nothing. I then tried booting it in safe mode and the applications successfully opened in there.
I obviously can't just boot my Macbook up in safe mode whenever I need to use it so if anyone knows how this problem could be solved? They were all functioning normally before I did the most recent update of OS.
I have tried repairing the disk permissions but that resulted in no change also. I do not have the start up disk for Mountain Lion so reinstalling the OS is not possible, nor is booting from disk.
I'm in my final year of college, in the middle of my final year project I REALLY need this fixed.

When I try to open iPhoto, Unity, Chrome or a few others it gives me the same error each time. "iPhoto cannot be opened because of a problem. Check with the developer to make sure iPhoto works with this version of OS X. You may need to reinstall the application. Be sure to install any available updates for the application and OS X"
But that doesn't make sense because I just updated the OS and all my applications are up to date also. I've tried reinstalling, no joy though.

Applications won't open after software update

after i installed an automatic software update on my iBook G4, and did the restart, several applications won't open such as Safari, iTunes, iChat. I tried to reinstall the software update, but that won't open either. it just jumps up and down like normal, and then won't open. after i try again, it jumps only once. what the heck is happening??? and i'm not very computer smart so dumb it up for me

Hello, and a warm welcome to the forums!
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot.
The usual reason why updates fail or mess things up, is if Permissions are not fixed before & after every update, with a reboot... you may get a partial update when the installer finds it doesn't have Permissions to change one obscure little part of the OS, leaving you with a mix of OS versions.
Some people get away without Repairing Permissions for years, some for only days.
If Permissions are wrong before applying an update, you could get mixed OS versions, if Directory is the slightest messed up, who knows!
If many Permission are repaired, or any Directory errors are found, you may need to re-apply some the latest/biggest updates.

I have Windows 8.1 and Adobe CS6 - acrobat just stoped working, won't open anything won't print to pdf. HELP!

Please help me!! I have Windows 8.1 and Adobe CS6 creative Suite. Adobe Acrobat x just quit, It won't open anything and it wont print to PDF. I need this for work!

Typically, the repair is done from the Control Panel>Programs & Features. In the future, try that route. Glad you found something that worked. When you do come to the forums for help, you may not get an immediate response, but may have to wait for someone familiar with your issue happens to check the forum, possibly after work. In any case, glad you have a working product again.

NSU N76 application won't open

Hi,
Installed NSU (v.1.3.85en) for N76 on my computer (Windows XP SP1). Installation was succesful, only the application won't open. Intro screen starting application pops up but nothing else. Anybody experienced this problem too or has a solution?
Many thanks.

Hi,
Installed NSU (v.1.3.85en) for N76 on my computer (Windows XP SP1). Installation was succesful, only the application won't open. Intro screen starting application pops up but nothing else. Anybody experienced this problem too or has a solution?
Many thanks.

Mac Applications won't open on startup

Whenever I start up my Macbook Pro, it's very slow when I log into my user account. It takes multiple attempts to open up programs such as Safari, Microsoft One Note, or Microsoft Word. The icon will pop up and bounce in my dock, then stop bouncing but not open. I have to right click and select "force quit" because it will tell me the application is not responding. It usually takes 4 or 5 tries before the application can start normally. If the laptop has been on a few hours, this usually won't happen.
I have tried logging in a Guest User account and everything opens up so quickly! Same thing when booting into Safe Mode and logging into my own user account. Rebooting normally, I still have this problem.
I tried following this thread but the fix seems to be user specific
All applications are up to date. This happened in Mountain Lion and now Yosemite (using 10.10 right now).
Specs:
MacBook Pro (13-inch, Mid 2009)
Processor 2.53 GHz Intel Core 2 Duo
Memory 4 GB 1067 MHz DDR3

Problem description:
Applications won’t open and won’t respond on latptop startup. It takes several openings and force quits before the application will actually open
EtreCheck version: 2.0.8 (95)
Report generated October 31, 2014 at 11:59:01 AM PDT
Hardware Information: ℹ️
MacBook Pro (13-inch, Mid 2009) (Verified)
MacBook Pro - model: MacBookPro5,5
1 2.53 GHz Intel Core 2 Duo CPU: 2-core
4 GB RAM Upgradeable
BANK 0/DIMM0
2 GB DDR3 1067 MHz ok
BANK 1/DIMM0
2 GB DDR3 1067 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
NVIDIA GeForce 9400M - VRAM: 256 MB
Color LCD 1280 x 800
System Software: ℹ️
OS X 10.10 (14A389) - Uptime: 1:41:13
Disk Information: ℹ️
Hitachi HTS545025B9SA02 disk0 : (250.06 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / [Startup]: 249.20 GB (82.29 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
HL-DT-ST DVDRW GS23N
USB Information: ℹ️
Apple Inc. Built-in iSight
Apple Internal Memory Card Reader
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Logitech USB Receiver
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/Library/Extensions
[loaded] com.sophos.kext.sav (9.2.50 - SDK 10.8) Support
[loaded] com.sophos.nke.swi (9.2.50 - SDK 10.8) Support
/System/Library/Extensions
[not loaded] com.AmbrosiaSW.AudioSupport (4.1.2 - SDK 10.7) Support
[loaded] com.rim.driver.BlackBerryUSBDriverInt (0.0.74) Support
[not loaded] com.rim.driver.BlackBerryUSBDriverVSP (0.0.74) Support
Launch Agents: ℹ️
[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[loaded] com.divx.dms.agent.plist Support
[loaded] com.divx.update.agent.plist Support
[loaded] com.examsoft.softest.plist Support
[loaded] com.oracle.java.Java-Updater.plist Support
[running] com.rim.BBAlbumArtCacher.plist Support
[running] com.rim.BBLaunchAgent.plist Support
[running] com.sophos.uiserver.plist Support
[loaded] org.macosforge.xquartz.startx.plist Support
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist Support
[invalid?] com.adobe.SwitchBoard.plist Support
[loaded] com.ambrosiasw.ambrosiaaudiosupporthelper.daemon.plist Support
[loaded] com.ea.origin.ESHelper.plist Support
[running] com.examsoft.softest.service.plist Support
[loaded] com.microsoft.office.licensing.helper.plist Support
[loaded] com.oracle.java.Helper-Tool.plist Support
[running] com.orbicule.uc.plist Support
[running] com.orbicule.uclocator.plist Support
[running] com.rim.BBDaemon.plist Support
[loaded] com.skype.skypeinstaller.plist Support
[running] com.sophos.common.servicemanager.plist Support
[loaded] org.macosforge.xquartz.privileged_startx.plist Support
User Launch Agents: ℹ️
[loaded] com.adobe.AAM.Updater-1.0.plist Support
[loaded] com.facebook.videochat.[redacted].plist Support
[loaded] com.google.keystone.agent.plist Support
[running] com.spotify.webhelper.plist Support
User Login Items: ℹ️
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Dropbox Application (/Applications/Dropbox.app)
Internet Plug-ins: ℹ️
DirectorShockwave: Version: 11.6.4r634 Support
OVSHelper: Version: 1.1 Support
Default Browser: Version: 600 - SDK 10.10
AdobeExManDetect: Version: AdobeExManDetect 1.1.0.0 - SDK 10.7 Support
Flip4Mac WMV Plugin: Version: 3.1.0.24   - SDK 10.8 Support
Silverlight: Version: 5.1.30514.0 - SDK 10.6 Support
FlashPlayer-10.6: Version: 15.0.0.189 - SDK 10.6 Support
DivX Web Player: Version: 3.2.3.1164 - SDK 10.6 Support
Flash Player: Version: 15.0.0.189 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
iPhotoPhotocast: Version: 7.0
SharePointBrowserPlugin: Version: 14.4.5 - SDK 10.6 Support
CouponPrinter-FireFox_v2: Version: 1.1.10 - SDK 10.6 Support
JavaAppletPlugin: Version: Java 8 Update 25 Check version
User Internet Plug-ins: ℹ️
Picasa: Version: 1.0 - SDK 10.4 Support
RealPlayer Plugin: Version: (null) Support
Safari Extensions: ℹ️
AdBlock
Reddit Enhancement Suite
Tumblr Savior
3rd Party Preference Panes: ℹ️
Flash Player Support
Flip4Mac WMV Support
Growl Support
Java Support
Perian Support
Time Machine: ℹ️
Time Machine not configured!
Top Processes by CPU: ℹ️
      14% WindowServer
      7% Safari
      6% SophosWebIntelligence
      3% soagent
      2% com.apple.WebKit.Networking
Top Processes by Memory: ℹ️
249 MB Safari
82 MB com.apple.WebKit.WebContent
53 MB com.apple.WebKit.Networking
47 MB InterCheck
43 MB soagent
Virtual Memory Information: ℹ️
688 MB Free RAM
902 MB Active RAM
744 MB Inactive RAM
533 MB Wired RAM
5.06 GB Page-ins
69 MB Page-outs

Applications won't open after Quicktime Update...and fix won't work!

Hello,
I'm having the same problem as many others: after the recent Quicktime update most of my applications won't open.
I've followed the instructions from Apple at
http://docs.info.apple.com/article.html?artnum=306043
However, when I do the "sudo" prebinding thing, I get this:
update_prebinding: error: dependent dylib is not prebound
update_prebinding: error 256 running updateprebindingcore
Any ideas?! Thanks!
B

jmchatt.
Your post has nothing to do with the OP's topic. That is called thread jacking. If you have an issue create a new topic. This way you can get the help you need pertaining to your issue.

I Just updated the software of my iphone 4s thru phone, now the photo application won't open... Please help me what to do?

Hi! I'm Ralph.. Just updated my iphone 4s from 6.1.2- 6.1.3. ... Now the photo application won't open... Please help me what to do

Why would this be covered under warranty? There is nothing wrong with the device, it simply needs to be restored.
As already stated twice in this thread, disable ALL security software on the computer and restore the device.

Applications Won't Open After Charging/Updating iPod

I downloaded several applications to my iPod Touch from the App store on my iPod. Then, I charged my iPod on my computer, downloaded the latest iPod update, and now the applications won't open on my iPod. When I press the application button, it goes to that app's opening screen and then goes right back to my iPod's main screen. What's the deal? Thanks!

This problem just appeared on my son's iPod Touch. I reset the iPod to it's factory settings. I did NOT restore back to my saved settings. When it was restored, I installed each downloaded application one at a time until I discovered which one was corrupting the operating system.

HT1766 My ipad won't open anything. Message: This ipad hasn't been backed up in two weeks.Backups happen when this ipad is plugged in, locked, and connected to wi-fi.

My ipad won't open anything. I get the message: This ipad hasn't been backed up in two weeks. Backups happen when this ipad is plugged in, locked, and connected to wifi. This device has beern plugged in and has 62% power. I can't access any buttons including the ok under the icloud backup message.

Have you tried a reset ? Press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider if it appears), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.

Preview app won't open pdf

Preview app won't open some PDFs. A screen opens that says "Please Wait... If this message isn't replaced with the original content of the file, your PDF viewer may be uncompatable"

Have you gotten those to open yet? If so, how?

Preview application won't open anything

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