Is Anyone Else Having This Problem With Yahoogroups?

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I recently tried to go to Yahoogroups tonight to take a poll set up by a member of one of the groups I'm on, and it told me I was not logged in. No matter what I did, it wouldn't take my password, so I changed the password, and tried again. Still nothing. I tried getting into other groups, and they all said "Hi (my name)" as if I was signed in, but offered me the option to join and would not let me access any of the features of the group. Is this happening to anyone else? How do you fix this problem?