I'm getting strange graphics corruption occasionally on one or both of my monitors where the graphics get all corrupted. I wish I could take a screen capture but every time I do, the capture comes out perfect despite the graphics/windows/text being jumbled in a blocky mess. (Updated with a photo of the screen) This only started happening after I updated to 10.6.7. If I reboot I might be fine for 10 minutes or an hour but it eventually comes back and almost certainly if I play multiple videos (eg. 2 or more) in Quicktime on the same monitor at once. My GPU config consists of... 2x Nvidia GT120 each driving a single 24" LCD ACD via MDP In googling this issue, I found out there is a known issue with Nvidia drivers with 10.6.7 not supporting Quadro cards... http://support.apple.com/kb/TS3740?viewlocale=en_US That's not my problem, but it is Nvidia driver related, indicating they changed the drivers in 10.6.7. Other's with 320M are complaining of slightly different issues... http://discussions.info.apple.com/thread.jspa?messageID=13312005 I'm wondering if anyone here with Nvidia cards and 10.6.7 has noticed anything? UPDATE: I took a chance and installed the NVIDIA drivers mentioned in the Apple KB article here. After some very preliminary testing, I can't seem to recreate the problem. If this ends up fixing this problem and this is not unique to me I'll be pretty disappointed with Apple's QA process.