I'm not sure if it's just something I did, or if my forum mailbox is a little off.
It started out by not telling me I had new messages, and then once I realized I did (3)... I keep getting messages that say "This message has been removed by its author before it was delivered. " I deleted the message once, and it popped back up as unread. I didn't even know you could delete a message while it's being delivered, and I'm not sure why it would say (0 new messages) if I have new messages.