Problem with quick look since 10.7.4 upgrade

Hi,
So ever since upgrading to 10.7.4 I've had a couple of new issues with quick look.
1.  Often when I first open quick look the file doesn't preview but opens only a grey square where the file "should' be.  If I close quick look and open it up again it works fine.  This is more a nuisance and not my real concern.
2.  The biggest problem seems to be relegated to pdfs:  If i open a pdf in quick look and arrow up or down to search through a group of documents the heading changes file names, but the content of the preview stays on the first document I opened. 
Anyone have any suggestions or experience this problem as well?

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
Note: If FileVault is enabled under Mac OS X 10.7 or later, you can’t boot in safe mode.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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