Here is something I can't seem to find anywhere online and have stumped even senior advisers at Apple. When I put any video in full-screen on my MacBook Pro retina display (YouTube, live stream, etc) There are about an half inch of a black bars or areas where the video doesn't fill in at the top and bottom of the display. Sort of like when you're watching the widescreen movie. The actual entire screen real estate does not fill with what you're watching. I also own a Mac mini through a thunderbolt display and any of the same videos on Thunderbolt Display fills the screen entirely or full of real estate of the display. I noticed this when I tried to either do a new screen recording from QuickTime or any third-party apps that allow you to record your screen (screenflow, ishowuHD etc) the results played back of a quicktime movie clearly shows the black bar or a smaller picture within quicktime instead of a full image in the movie. Thoughts and thank you.