Anyone else have this problem/know how to fix it? Alt tabbing does absolutely nothing

I have the same issue. Can't alt-tab out of the game e.g. when it crashes.
The only option (fastest one) that I know is to just Ctrl+Alt+Del and then choose Logout (of Windows).
Then log back into Windows from the log-in screen. This is quicker than a full Restart.

I don't own this game, did you try WinKey? I generally use this when Alt-Tab doesn't work.

I have the same problem. Very annoying.