[major_setback]

I have the same problem. I haven't found a solution.
It worked sporadically for a time, then after recent patches and a re-install it doesn't work at all (I can hear it working in the background only).
I don't think it's a display driver crash, but for some reason the minimized game won't open to full screen size. You can see the tab at the bottom of the screen, but it won't open up. Alt-tab doesn't help, nor changing to 'windowed' game-play.