Before writing I triedthis hit
Could be corrupt plist. Try deleting the com.apple.QuickLookDaemon.plist
Found in ~/Library/Preferences/ com.apple.QuickLookDaemon.plist
Finder>Go (dropdown menu)>option key>Library
If no good delete Cache.db Found here:
But I forgot to restart.
Restarting All problems solved.
Sorry for the post.
I hope it shoul be useful to someone else
I removed all those files (preferences and cache files) and rebooted, but the problem still occurs for me.
For me, this is on OS X 10.9.2. I have it happen on all my computers, so I have no idea what's going on.
This error message goes to the Console.app:
3/27/14 4:46:03.132 PM quicklookd: Warning: Cache image returned by the server has size range covering all valid image sizes. Binding: VariantBinding [0x403] flags: 0x8 binding: FileInfoBinding [0x303] - extension: R, UTI: com.apple.rez-source, fileType: ???? request size:64 scale: 1
As well as a ton of errors that look like this one:
3/27/14 3:28:51.488 PM quicklookd: objc: Class TSUMutableNumberFormat is implemented in both /Library/QuickLook/iWork.qlgenerator/Contents/MacOS/iWork and /System/Library/PrivateFrameworks/OfficeImport.framework/Versions/A/OfficeImpor t. One of the two will be used. Which one is undefined.