Played beta, no issues aside from the normal bugs and crashes. Updated, loaded into the head start. Everytime I click my mouse the screen flashes, and I have caught glimpses of my desk top. I do run a crossfire setup, with two 4670s. I lowered, and then finally disabled the ai, mouse clicking causes the same issue. Disabled crossfire, same issue. Removed secondary video card, same issue. Temperatures are normal, can run all my other games with no noticable problems. Only started occurring with the headstart, and its newest patch. I am using the newest ati drivers, on windows seven enterprise 64.
*EDIT* problem solved, game forced itself into "windowed maximized" mode. Weird, as I never run ANY game in windowed mode.