After about one great month with my MacBook I've ran into an issue. Any video played full screen in a browser like Safari or Firefox has artifacts, but when I move the cursor around to display the controls the artifacts disappear. I loaded up a purchased video in iTunes and it's worse: the screen on full screen videos goes completely blank with sound continuing, but if I move the cursor to show the controls, change the volume or change the brightness the video comes back. The video goes blank again once these overlays disappear. Only in full screen. Trying to see if it is the hardware, I booted Windows up, installed iTunes, and videos played full screen without a problem. No disappearing full screen video and no artifacts. So I guess it's something to do with El Capitan and/or iTunes. I have two other Macs (2014 mini and 2013 rMBP) running El Capitan without these issues. I'd like to avoid a complete reinstall or trip to the Apple Store if I can, but any suggestions? Cheers.