I think (but I don't know for sure) that the "main" site and the board are not really the same account even though there's some kind of link between them.
From the board, try clicking your name at the top and then "edit", i.e.: http://bike-pgh.org/bbpress/profile/melange396/edit
Do you have an email address listed there? FWIW, I do get email when I receive PMs, although I don't see any setting for it on that page or elsewhere - but it could be I just can't remember where it is.