Fullscreen auto reverts to windowed

[Blazed420]

I have been playing for a couple days now and loving it. Unfortunately the only problem im having is that when i try to go to fullscreen my mouse clicks THROUGH the window and thereby goes back to windowed. Ive tried on multiple resolutions with the same result. Running on vista 64 bit. Ive tried compatibility mode but the game crashes as soon as i try to boot it up. I can handle windowed but it would be nice if someone has my magic answer.