I just down loaded the game and i cannot alt tab out of the game AT ALL. Ive read all of the a forum topics and none of them accurate describe whats happening to me and none of those fixes did anything for me.
The game will not alt tab, as if the option was taken away. It works when the game is not running, but never when the game is open.
have something like notepad open in the background, then start the game, so you have something to alt-tab too.
or try the windows key to open the start menu then open something.
I find quite a lot of game resist alt-tab the first time once they loaded, but once you have managed to force the issue each time you have started the game you can shut the application down you have in the background that permitted you alt-tabbing.
also are you running full screen or full screen borderless in the game options, as the later may not minimize.
