Sam, I just replied to the other thread where you ask about this. Six PMs an hour is set by the server software, not by us. Lois has us maxed out on that feature.
My best guess is that you were getting ahead of the system trying to send too many PMs. Now that I see by the time stamps that it has been well over an hour, try again and see if that doesn't resolve things. It always has for me.
SoftGameHunter
RavishU moderator