According to the horse’s mouth over at the Starcraft II forums, a bug in the game affects players  not playing with ENOUGH on screen details.  Effectively, the game gets bored and begins redrawing the screen rapidly over-and-over at high speed, like giving a five-year old a sack of crayons and an espresso and making him sit quietly outside the dressing room while Mommy tries on dresses.

A workaround is given on the forum, and since this IS from a list of known problems, it’s pretty safe to assume that a patch or update will be onhand soon.  Still, it’s odd to see a game that frags your system for NOT playing it hard enough.

Then again, this is Activision…