This is a very real problem for me. I bought 2 identical 13" MBP's for Christmas. Both have since been returned with this pixel distortion issue. We were always able to make it behave by changing desktops or other actions, but it was a persistent and worrisome issue. The first machine eventually failed to accept a charge and was swapped out by Apple several weeks ago. Seeing that progression, I brought my copy into the Apple Store Genius bar and they swapped it out as well. Thinking I had a "pair" of computers bought at the same time from same store and recognizing QC issues are inevitable, I was happy with the response from Apple. But - - Today my 3 day old replacement booted with a corrupted, pixelated desktop. Again, swiping to a second desktop and returning fixed the problem. But i am now again worried. A return to the Genius Bar is likely in my near future unless today was an anomaly.