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If it is standard then switch over to Enhanced Interface - Full WYSIWYG Editing and see if that works.
I have seen it happen a couple of times at other forums and changing the editor normally clears it for whatever reason.
This Guy
Click on Settings at the top right of the page.
Then scroll down and on the left hand side click General Settings.
Scroll down to Miscellaneous Options.
With Message Editior Interface what option is selected? Try the Standard Editor and see if that works.
