BuddyPress.org

p.s. FYI… I did once successfully change a WPMU+BP URL. So it is possible. But I was the only user and the site had basically no content and no user blogs. Unfortunately… I did not document all of the DB and wp-config changes I had to make to make this work. But it wasn’t all that bad. I think I had to change the URL in maybe half a dozen places. I used the search function in PHPMyAdmin to sniff out the old URLs.