It's a problem between Internet Explorer and the program we use to display the media. I'm working it out with tech support. In the meantime, I've reverted to the original video menu for users of Internet Explorer. So at least everything is working. But if you want to use the new, friendlier YouTube-style video menu, you'll need to use one of the other browsers listed above... at least, until I get this bug worked out.
Regards,
Jonathan