There is a better spell checker option. I saw it on the board of the guy witt the shroomery or something similar.
Anyway, I got it to work on my site great. It drove me crazy trying to get it to work, but it does work well. You can see it here
www.digitalweddingreview.com. Actually, I just realized I have now made all of the forums private.
Check it out at the original guys site.
http://www.shroomery.com/forums/ubbthreads.php