Side note: the video player is really annoying, hitting the 'full screen' button uses the terrible full screen functionality of OS X rendering my second monitor useless.
What browser are you using? what version? What operating system are you using?
Windows 7 Professional x64 SP1. No video on the following 3 browsers: Firefox 19.0.2, Chrome 25.0.1.1364.172, and Cyberfox 19.0.2 (a 64-bit build of Firefox). I get video, but the audio is choppy on IE 9.
It seems to work on my iPhone with Safari (iOS 6.1.2) but the bandwidth required is too great for my 4G connection.