There was a change on Thursday or Friday in the way the cookies are stored. Before your cookie would work for either
http://dnforum.com OR
http://www.dnforum.com, but not both unless you signed in once at each address.
Since then, we implemented it so that the cookie works for both. This did cause the issue of you not being able to log out properly, and have the correct cookie assigned. To effectively log out and have the new cookie method impletmented, you will need to go in manually and clear your cookies for dnforum.com or
www.dnforum.com. This can be done by a few different methods depending on your browser.