I encountered a problem viewing YouTube videos on my Mac using the Safari web browser. I haven’t been surfing for a while so I hadn’t really noticed it until now. I found it quite odd. I pulled up several videos in Mozilla Firefox and it worked fine.
After doing some research, I found out that it was a problem associated with YouTube’s HTML 5 beta project. Apparently, they haven’t worked out all the kinks yet it seems.
For those of you who may be encountering the same problem, here is the fix:
Click the Leave the HTML5 Trial link.
Hope this helps!