I never have any problems when I alt + tab out of game. Nor when I press the windows key.Obvoiously it takes a few seconds and the sceen turns black a few times since its changing video size and mode. How are you running the game? The only problem I have related to this is when im running 1.5 on my lan, if I alt + tab out, when I come back in I have no sound till I close the connection with the server and reconnect. Doesnt bother much since put my status on away on MSN.