I just had this happen when using Firefox on a very short PM. I ended up having to use Internet Explorer to send the message. Also in Firefox I was not getting the blinking cursor, it was pretty strange.
I have been sending 1 pm/day now for a while, then I get a notice that I have reached my 2 pm limit/day and can't pm anymore. Whats up with that. I know I'm new to this form, but why is there a restriction on pm's. Is there some where on here with the rules so I can at least see what I need to do?