Sometimes when I try to cmd+tab out of the game (Which has always been FAST and flawless on my 2010 mbp) the game freezes (l4d2) and I can move the mouse, but nothing else is responsive, until I restart. I cmd+tab out a LOT, so this is no fun. Any ideas? Oh, I have the new 2011 MBP with the 2.3ghz proc and the best GPU (forget the # atm). I play at 1920x, all low settings, except textures on high and AF on 8x. no vsync or AA. EDIT: dont even need to alt tab. Happens without it now. Fun. Also, so far has happened with L4D2 and CSS. Havent tested any other games. Console shows nothing that would be helpful to diagnose the problem. Did a fresh install of 10.6.6 and get this problem.