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My uneducated guess would be GFX card overheating. At least I get similar things in many different games/3d applications, usually closing/restarting helps for me.
This is what it appears to be to me as well, you'll usually see an explosion of artifacts when your video card starts overheating or dying. I have also seen this happen in the native client on a healthy PC with no heat issues, but it was an extremely rare occurrence.