I'm guessing the system is expiring your login session while you are busy drafting a very long message. When you try to submit the message, your browser thinks you are still logged on, which disagrees with the server's idea that you are not. Posting a long message via copy/paste from notepad works, because the message (regardless of length) is entered faster than the session timeout.
KEN CORMACK
Clan Buchanan
U.S. Coast Guard, Retired
Cuyahoga Falls, Ohio, USA
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