then I read some posts in this forum that suggested it was a Flash issue or HTML 5. I installed the extension to disable HTML 5 and it worked a bit. I was able to view my videos in 1080p but every time I mouseover the YouTube play bar near the resolution area, the entire video would shrink on the screen and contain a lot of black masking and the controls disappear. Like this:

None of this occurs in standard Chrome. Any ideas how to correct?