I noticed when when I'm not logged. I sometimes mistake I'm logged in hit "reply" in a thread and get directed to http://www.netbuilders.org/gdirect.php . However when I log in then get redirected back to http://www.netbuilders.org/gdirect.php I'm guess this is a unofficial VB page that was made for the forum??
There should be code on the page that checks for a session and also the redirect URL session to redirect you off it if you already logged in and to the thread you wanted.