As a note, at UGN we're running 6.3.1, you can see it running on 6.4 at our test site:
http://www.promodtecnologies.com/cgi-bin/ubb/ultimatebb.cgi We'll be upgrading to the 6.4 when we get all of our presant modifications to work on it, who knows, perhaps I'll publish other ports.
