I've read of similar problems on other InvisionFree boards. In fact, on another InvisionFree based board I'm on, my PM system has been completely disabled. It claims my PM folders are full when there isn't a single message in there. There are simply none to delete. I can't receive any PMs, and sending them is pointless. InvisionFree's PM system is just plain buggy. For now, I have no problems here, but I don't know how long this will last.
If it's too much of a problem, we can just use the [hint]email function[/hint] for now.