Alt-Tab Out of Game Makes Crazy Lines, Etc.

If I Alt-Tab out of the game (hate full-screen with two monitors, but trying to retain settings for benchmark consistency), when I come back the game looks like this:

 

http://s20.postimg.org/g0jh98ohp/Its_Full_Of_Lines.jpg

 

How can I turn this off once it's on and how is Alt-Tab turning it on to begin with?

 

Thanks!

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