Here’s another little fix that I performed on one of my computers that I thought I would share. When I play videos on sites like Youtube, while in full screen mode, the video itself would often freeze after playing for a minute or two. The audio would continue to play correctly and if I would escape from full screen mode back to a normal video playing in the webpage, the video would begin to play correctly again.
It seems that using hardware video acceleration was the culprit. Once I disabled it, everything worked fine. This is easy to do. Just right mouse click on the video that is playing. 
Then a window should open that says Adobe Flash Player Settings. Select settings and then uncheck the box that says enable hardware settings. If you don’t have that option, you may need to click on the icon at the bottom right of that window. It looks like a monitor with a paintbrush. And that’s it. Your videos should now play in full screen mode without the video freezing.
