Quicklook is broken in Lion

Solution 1:

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.

Solution 2:

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....)