[continued from support email]

Thank you for taking the time to offer your suggestions for solving my video problem. In case you are interested, I solved the problem by clicking enhanced video on the preferences menu.
And no trouble with that? That's interesting, implying maybe there is a problem with the Windows Media Player on these machines. If you get a chance, I'd be very curious to know if upgrading the WMP to the latest version solves the problem without using Enhanced Video. I ask because some users have trouble with the Enhanced Video option--e.g., hearing but not seeing the first video played in any given session.