Okay, with a little manipulation, I tried to install this into the 6.5.0 Beta 1 release.
There were a number of files changed in the 6.5.0 b1 release from 6.4.0+
These files include:
ubb_lib_files.cgi
ubb_new_reply.cgi
ubb_new_topic.cgi
ubb_profile.cgi
ubb_registration.cgi
ultimatebb.cgi
I had to manipulate some of the code to get it to work--and thought that I had actually done it--until I clicked on the "My Profile" link.
What happens then is it generates a plain, white screen. That's it. No text. No error message. Just a plain white screen.
I'm going to leave it up at my site for right now. It's at
http://adwoff.com/ubb-test/cgi/ultimatebb.cgi You can log-in under
Damn Bug 
with the password of
CVWG38 ... or you can register on your own. I did register successfully, so the issue is when I'm logged-in and I attempt to access my profile OR the directory.
If someone could point me in the right direction, I'd be most appreciative.
