That's what we're experiencing too. I'm starting to think that clo just isn't meant to be here.
I successfully unbanned OCU from this forum, so unban IS functioning.
Then I hopped over to ROUND, banned clo, logged off, logged on and unbanned her.
So, I don't know what's going on. You didn't make her a board moderator at some point, did you? I think there is a feature that prevents moderators and owners from being banned. It would be kind of stupid to make it impossible to unban them, though.
Most likely, it's some sort of a bug. Or Bob had it hard-coded that clo cannot post to the POPE board. I can't say as I'd blame him.