Here we go, Paul. I reinstalled everything, set the permissions for users with 100 posts to be promoted to group id#15 and gave that group access to the chat. It worked like a charm. But then members of group id#2 began grumbling because they couldn't chat anymore so I re-added group id@2 to the allowed list alongside 15. Now, group 2 *still* can't access the chat. This makes no sense at all. All I did was restored the default configuration... I even deleted group 15 altogether and just have id#2 there now. Now no one but admins and mods can get in.