I had a problem posting a Quick Reply to a message. The site responded "You do not have permission to perform this action. Please refresh the page and login before trying again."
The problem is that the page showed me as logged in. I had to actually log out & then log back in before I could do anything. (I never did post that reply-by the time I'd done all that somebody else had provided the answer. I'm not upset about that, but I *am* wondering if that was what caused the problem, i.e. maybe the page updated while I was typing my reply? I'm pretty sure it's happened before, though, without any problems-but something screwed up this time.)