Hi all- 2010 Mac Pro, 12 core, Radeon 5770 with dual 27" cinema displays. Running Lion. Occasionally, the display will get corrupted...where the display from monitor one will "shift" over and spread out partially over both monitors, with the far left hand side of monitor one will have the far right hand side of monitor two...sounds confusing, I know. Also, there is "tv static" looking areas at the top of both displays. I can move the mouse over to the area where the apple menu is, and choose log out...and upon logging back in, the problem is fixed. There is no rhyme or reason when this happens. I've had it happen when watching video in full screen, and I've had it happen while working in an Aperture window. Any ideas? Many thanks to all who respond.