Are you tired of seeing this shit on YouTube Full Screen Video?
When clicking on the fullscreen button, the video stretches to about 3/4 of the screen, and the rest is black, so it's not really full screen at all. The hiccup is just in the graphics, because the controls (X Y positions of the buttons) are correct - in the corner on the screen, not where they are displayed.
This problem occurs in Google Chrome, and it's a problem with the Flash Player. To fix it, you need to go to the URL chrome://plugins/ in Chrome, and disable this plugin:
Refresh the page and...