Jennifer,
Yahoo was having issues yesterday, and several groups were off line. I, myself went to one of my groups' web pages and it showed it as unavailable, but it came back later.

You probably don't have to do anything other than check back again today or tomorrow. Sometimes when they have these kinds of problems it takes a few days for everything to get straightened out. The other thing you could do is to go to one of the groups that's missing on the list and see if it says you are still a member - it probably will, or it will say you can't get to that group right now.

Hope that helps. If still having a problem in a few days, please let me know.

Kitty