Re: rmail issues
If I recall correctly, this is sometimes indicative of a corrupted cookie...but I'm not expert enough on the point to be able to tell you for sure how to check or how to fix it if it is. It just sounds like a lot of other situations I've read on here where the solution was to do something about the cookies...usually logging out and logging back in, or cleaning out all of the old cookies from RPOL and restarting your browser or computer, I think.
But, like I said, I'm going on the basis of an unclear memory of a subject I don't really understand too well...