During action scenes or scenes with a lot of movement, the video pixelates and stutters to the point where it's unwatchable. It does it with all video files and with quicktime and vlc. I've tried reinstalling and still nothing. I've searched everywhere for a solution but I can't come up with anything. I have a 2011 MBP Core i7 2.0 GHz 8 GB Memory. Here's some images of what it looks like, maybe that will help.