Bob
I have the same problem on IE 9
(I am using Google Chrome to post my messages)
On IE 9 when you get to the point of typing your messages it will let you enter everything and the you push the send message button and,,,,

1.The message you have entered is too short. Please lengthen your message to at least 10 characters.

The message I entered and got the error is the text above (more than 10Char).

Thanks
Mike