.Mac Tutorials / videos stopped working in web browsers

Sorry - this is a cross post from .Mac discussion group.
I can't see any of the video in the .Mac Learning Center. Can hear sound but that's it.
Tried using IE 7 as well as Firefox 2.0.0.9
Only thing that I can think of is that I upgraded iTunes to 7.5.
Any ideas?
Windows XP Pro SP2
Any ideas?

Windows Quicktime should be run in "Safe" mode

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