I have been using my new 15" MBPr for a couple weeks now and loving it. I have run it pretty hard through two different video projects (Premiere CS6) and it scrubs through H.264 1080p footage like a dream and renders faster than real time. However I now I have a nagging little problem. Now and then I get little colored pixels popping up in a group in the middle of my screen. They are appearing on the retina display and the external (Acer H233H) attached by HDMI. They will also pop up occasionally when no external display is attached. The MBPr is under warranty (and I also bought the Apple Care). I just want to see if any of you guys have seen this before I call Apple about it. No Apple Stores local to me, so it's not as simple at just taking it to a Genius. (two hour drive). I tried a search for this issue, but I am either not using the correct terms or it's not a common problem since none of the results sounded like my particular issue. While I was typing this it popped up twice in different locations, so I snapped a screenshot. Really loving this thing and hoping it's not a serious issue.