I’m having the same problem and the visual editor button is selected. The only thing that worked, but only temporarily, was to remove and reinstall the blog 3-4 times. It was working when I last logged in on the 16th and now, on the 21st, the icon buttons for visual editing are gone. I’ve deleted my cache and restarted the browser, too.
I need this little bug to be fixed because I have clients who need to edit their blogs and they can’t because they don’t know HTML.
HELP!!