I've run into this same issue a few times, ususally when trying to edit very shortly after making a post, just a blank edit box.
http://forum.calgarypuck.com/showpos...69&postcount=3
I had spelled weird wrong and tried to edit it with no luck. Just for giggles I copy/pasted the whole post again into the edit window and that worked. The strange thing is that now if I try to edit that post it works fine?
It's the exact same text only with the e and i reversed so it can't be a problem with some sort of special characters right?