I have two domains hosted by the same ISP. I forward one domain to my joomla install. If I login from the forwarded domain, the screen refreshes (the user is actually logged on) but the mainmenu is not updated with the registered user menu items. If I logon directly using the actual hosted domain, everything refreshes properly.

If I click Home on the mainmenu (from the forwarded domain, the screen refreshes properly??

Any ideas?