Check the error logs, try cookie and file clearing within your browser, etc.
Also check to see if wp-includes/js/tinymce/tiny_mce.js exists and see if it's readable. Heck, check to see if those files are within the tinymce subdiretcory there and and readable by the webserver. The check is looking for that file though.
I do note see the rich editor either and I note that when I visit the profile on your site, I don't get the check box either.
The javascript file(s) for tinymce may be corrupt also. How did you upload them to your server?