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I have this same crap on my early 2o11 mbp 15" and I put in a NEW logic board (apple care) new ssd and ram (me) fock!
 
i agree its a graphics driver issue as my macbookpro 13 sometimes when i start up world of warcraft the game artifacts i shut the game down and restart it and its fine then and it does not do it all the time. i know when i was on guild wars once when i was running windows it was graphics glitching with me once i updated the driver and it was fine then
 
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