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The above message appears after posting a message. I thought that it had been fixed but it seems to be back. I'm guessing that is why we are getting a lot of repeated post as you think it hasn't posted and repost it. I've seen 4 repeats. I've done it myself but now know to ignore it as the message will appear normally.
Sod's law and the message didn't appear when I posted this but I'm not saying it won't appear when I save this edit!