Issue Fixed: Media Center Expiring in in Vista Community Tech Preveiw #3
Story to come later...
If you have access to the Vista Beta site the fix is up there. If you don't have access you either got it from MSDN or "other" means.
MSDN will have the fix a bit later.
I'll explain how this happened hopefully today. I have some work to catch up on first since fixing this issue took a good part of the last two days.