I was able to get my cms to work at root and forum in a subdomain. However: 1. Flash uploader does not work from CMS 2. Some browsers seem to ignore the base ref metatag and call javascripts and CSSs on the wrong folder (root). This happens with Blackberry's v4 and v5 own browser. I get some 300 or so 404 error messages a day for a site with an average of 400 simultaneous online users.