This has happened more than once. When I open certain apps/games that apparently use SDL or some kind of graphics (sdlmame, Dungeon Crawl Stone Soup, etc), at random times I get this effect: http://tinyblackbox.net/webpost/85710873/P5_bug.m4v That's NOT the scanline effect you see when you record CRT monitors (this is an LCD). That rapid re-drawing is really happening, and it COMPLETELY locks up the Mac, to the point where I have to do a hard power-off. Not cool. Not cool at all. This is definitely a problem with Parallels, as these Linux apps don't cause this on my Eee PC. Anyone else had this problem??