The game just arrived in my mail. I've installed it, followed by both patches, in the correct order.
I've started a new campaign and even before I get to control my character, the game goes to the background (as if I did Alt+Tab). I can't return to the game, although I still listen to the game's sounds.
I have to terminate the game (Ctrl+Alt+Del) and start again, to get the same problem all over again.
I have windows vista 64bit and I have ArmA2 and all expansions and they all work fine. What coiuld be the problem? How can we fix this?
Edit: it happened while playing with the editor as well.