For this roleplay and most of the others im in i don't get the emails to let me know there has been a reply. For this one i know there have been at least three replies and i didn't get any emails...
Have you checked that the subscription is still checked in RP:s your in? If that little subscription box has an 'x' in it you should get an e-mail every time it's posted in.
Otherwise, perhaps you should check what e-mail is set for your account. It might be the wrong one?