Switching users and get white screen

I have now had this happen twice, and it seems to be a mountain lion flaw. I am either logged in and switch users; or I am logged in, it goes to sleep, I wake it, and then switch users. I cannot isolate it completely, but I get a white screen. I am able to move my mouse, but everything is white. I eventually have to just shut it down. I have reset my PRAM, and at a later time even unplugged my computer for a little and rebooted. It takes a few days to get it to reoccur. I think it is isolated to the following scenario, but not positive: I am working on my user, leave my computer, come back and it is a sleep, wake it from sleep, and then switch user, and then WHITE SCREEN where mouse cursor can be moved. I am using a Mid 2010 imac.
Please Help,
Sam

The 10.8.1 seems to have fixed it from locking up completely, but the transitions between usres is still slower than Lion. At least no freezing up yet.

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Message was edited by: AMILLIANZE

Switching users and get white screen

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