Please help guys, I am having an issue with few months old mac. When i play a few videos in QuickTime (for example the last time a video recorded in slo-mo on my iPhone 6S) and enter full screen mode, and then click on a "remove edges" little button, the screen goes crazy! Here are some shots how ti looks. I noticed that a few time while watching random videos online, not very often. What could be the problem? 
