I have a user who has reported something I've never seen before, and he's sent me the screenshots to prove it. He can respond (reply) to existing threads, but when he clicks on New Thread, he gets an error message that says "The selected forum has been removed from your list of Followed Forums. In a moment, you will be automatically returned to the forum." Then he's returned to the same forum. (I've attached the screenshot.)
I looked at his account, and his permissions appear to be normal. He's not following any forums but is following one thread in the same forum (The Engine Shop). I have not asked him to try creating a new thread in any other forums. I can do that, if necessary.
Obviously, this is a canned message from the software, so this is some sort of anticipated condition, but I'm completely unfamiliar with it. What would cause this?
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