When creating my post regarding the authentication error I thought I'd have a preview of it, on clicking the tab I got a jQuery busy gif in the top left of the view but no preview when this gif went away! So I clicked the Rich Text tab again and my text was gone! I thought it may have been a hiccup with me having an image attached but I have just tired it again with only "Blah, blah" as the message body and I still get no preview and my 'original' message in the Rich Text tab is missing when I return to it.
Is this just me? I am using Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:43.0) Gecko/20100101 Firefox/43.0.4 Waterfox/43.0.4