Hiya, had this problem before on a diff site, slightly diff symptoms this time.

I recently put a new XOOPS 2.0.14 on it's own domain, edited the mainfile.php to resolve on the new domain, then my admin access through the new domain changes/disappears. I get the welcome msg when I log in, but get "sorry, don't have perm..." msg if I try to access admin, edit user, etc. (using direct links in address bar because user menu is not visible).

I can access it all if I use the subdomain it is originally installed on, again I have to type in the url to get to anything in admin as all the links now resolve on the new domain.

Any ideas?
DJ