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[Turns out this is known bug #9536151]

I have a strange issue with Quicklook in Lion. This is on a clean install and happens with more than one user. It also isn't fixed if I clean out the Quicklook cache in /var/folders

I have to push the spacebar twice to get Quicklook to work properly.

The first time the usual Quicklook 'window' appears but it is blank:

Blank Quicklook

Push the spacebar again and the image appears. If I restart the Finder the problem goes away briefly. It's driving me nuts.

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Have you opened it in Preview.app to verify it's really a jpg? –  nicerobot Dec 11 '11 at 20:53
    
The image appear fine when I push the spacebar second time. –  Gazzer Dec 12 '11 at 3:28
    
Is there a way to completely reset / regenerate QuickLook preferences (system-wide)? has an accepted answer that might help. –  Graham Perrin Nov 5 '12 at 10:22

2 Answers 2

up vote 2 down vote accepted

This sounds like a bug; you can report it at bugreporter.apple.com with an Apple ID and password.

Can you reproduce the problem, then check for new error messages in /Applications/Utilities/Console.app? There's a small chance that this will indicate the source of the problem.

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You might see a message in the console like this:

com.apple.quicklook.32bit[22808]): Job appears to have crashed: Abort trap: 6 

You should file as bneely says.

Have you tried the usual stuff of repairing permissions, restarting etc.

Also, if you file a report, you should include your system.log (/var/log) and Apple System Profile report (About this Mac > More Info > System Report > save....)

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I'm not getting any messages in the logs at the moment. –  Gazzer Dec 12 '11 at 15:56

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