Black window when starting

When starting the game I just get a black window (size of full screen, but with title bar). When I move the mouse I can hear some mouse over sound effects when I move over menu items (I believe it is). I tried the game on another computer away from home for 10 min when I bought it, and here it worked fine. Maybe it is because of different resolutions or similar on the two pc's, but I disabled cloud save, deleted local files, and tried again - still black window. Any pointers?