I changed the resolution to 1240x720 and didn't have the black screen problem once in an extended game, so I suppose that fixed it.

I've been getting sudden black screens at what seems like completely random times during games. Sometimes if I click around the screen it'll cut back to what's going on but more often I'll have to alt-tab to try to get back. Sometimes after I alt-tab the game won't return to the screen so it's basic...