Whenever I alt+tab or windows out of starcraft and get back on it, it becomes weird colors and it is really hard for me to play. I have to exit starcraft and run it again to fix it. Is there a way to fix this problem without exit?

I suggest you update your vga driver. If that does not work, contact your distributors for support.

Yeah, I had this same problem when I rebooted my computer and my partition had gotten screwed up(lost all its drivers) You need to get the correct driver for it to work right.

I have gotten the same error when I was running something in the background. Perhpaps try running SC without anything else running in the background and see what happens. Can't guarantee anything, though :\

You wait a few minutes and it goes away. Or at least, that's how mine works.