I have a 21.5" iMac. I'm using a secondary monitor with a mini-display to VGA. When I open SCII and put it in full screen on the iMac, it turns the 2nd monitor black. I'm probably missing something simple, but is there a way to make the second monitor able to be used and 'unlocked' while in full screen mode inside the game? ---Not to play on both screens, but to be able to do other things on the computer while playing as well. Thanks.