I keep getting a glitch where the entire screen flashes white, and the game locks up for a split second. Running windowed seems to reduce the frequency, as does disabling my 2nd monitor and closing as many backgroup apps as possible, but this could just be my brain's pattern-recognition playing up. The flash is bound by the game window, so it's not a monitor problem. I don't have this problem with any other game. ATI Radeon 4870 1GB Intel Q9550 4GB RAM Windows 7 Have tried turning off Smooth Scaling and playing at different resolutions. DirectX is up to date. Any help is appreciated.