Ok, so 3 times in the past week or so, my 2011 Air has just frozen solid when opening applications. I didn't pay attention the first or second time, but the third time I was trying to open iTunes and the beachball appeared on the screen - all commands stopped working except the off button. Problem is, when I switch the Air back on again, I'm not getting any error/bug reports so I have no idea how to troubleshoot? FWIW I never had a crash before Mountain Lion, so I'm assuming that OS 10.8 is the problem. Does the system produce a crash log somewhere?