Same here. It says, "This browser does not support video play back."
I didn't have any problem before, but it started happening just a few days ago.

http://www.atpworldtour.com/en/video/federer-upends-djokovic-for-seventh-cincinnati-title

That video doesn't work for me on Opera, either.

My Opera's up to date, buuuuut I'm still using Windows Vista...
Could that be the reason? I just want to know, so I can either accept it and move on, or do something about if if there's any other reason. :^(