Just wanted to mention that I've had the same sc2 error 3 times while playing the new version, which never happened in the old one. What happens is when I try to alt+tab back into sc2, the game black screens out and becomes stuck that way and I'm unable to close it even using task manager. Every other program then becomes inaccessible. I'm only able to get rid of it by signing out of windows. I have absolutely no idea what in particular might cause this and I don't know if this is any help, but I'm 100% certain it's real. This time it happened at the end of the game. I alt tabbed right as game ended and when I tried to get back to sc2 it was frozen that way.