I have tried the htaccess route and it does work, however, once your users are in the board, they see the full URL to the ultimatebb.cgi script.

I have used another BBS (YaBB) where you can change a config var so that the path shown in the location line shows only the folder with the .htaccess DirectoryIndex line. Ex:
www.sitename.com/forum/?ubb=forum;f=1

Can you do this with UBB by changing the cgi URL in the main config from
http://www.sitename.com/cgi-bin/forum
to
http://www.sitename.com/forum/
(once you have the .htaccess file uploaded)

I'd try it, but I'm concerned about such a fundamental path screwing something up.

Thanks,
Greg