QuickLook blanks when displaying some images When using QuickLook to quickly look through multiple images (pressing space and then using the arrow keys to navigate), some images will not get displayed by QuickLook when hitting them up a second time (going back for example). 

A GIF does a much better job than me showcasing the issue. So here's me previewing a few random images:



I have tried deleting 

~/Library/Preferences/com.apple.QuickLookDaemon.plist ~/Library/Caches/com.apple.QuickLookDaemon/Cache.db
~/Library/Caches/com.apple.QuickLookDaemon32/Cache.db
~/Library/Containers/com.apple.quicklook.ui.helper

and restarting, unfortunately to no avail.

Repairing permissions and restarting the Finder in 32-bit mode, as suggested  by others, don't appear to have any effect on this issue either.

This happens with all kinds of images, no matter their source or format.
This "blank Quicklook image" Bug is caused by the activation of the undocumented TextSelection-Feature. 
As soon as I deleted that feature with this terminal command the blank images were never seen again ;-) 

defaults delete com.apple.finder QLEnableTextSelection; killall Finder;


If this delete-command doesn't work for you, you could try to disable the feature with 

defaults write com.apple.finder QLEnableTextSelection -boolean NO; killall Finder;