I think I found it, Morgan.
Is it http://www.britbike.com/forum/ultimatebb.cgi?ubb=get_topic;f=13;t=009982;p=1#000007
That doesn't give me a 404, but it does indicate a permissions problem if I got it right.
I'm also thinking the permissions on the config file in the non cgi directory are not right as that file seems to have the wrong URL and is redirecting to the wrong place.