Hello there! I am using a Mac Pro with Mac OS X 10.8.4, always installing all updates. Since a couple of days ago, even though I didn't install anything, WindowServer started crashing. It looks like my desktop becomes slightly whiter than usual, then it's like I've re-logged-in. The crash log of the approximate crash time is http://pastebin.com/uWdeVxPP. What may cause this? iStatMenus? Some faulty device? I use an Audigy2 card with kX drivers and it makes the computer freeze with an annoying beep, but not that frequent, and it didn't crash WindowServer for the past 7 months. Maybe a bad GPU? Anybody ever experienced this? Already done all HDD checks and permission repairs. Thanks.