Forum Cannot Log Into my Own Forum
 

I just upgraded my forum from V3.70 to V4.03. Now, I cannot log into my admin account from the index page:

http://audioheritage.org/vbulletin/

I can log in from AdminCP, which is a work around. However, if I try from the index page, it does accept my username and password, and then it takes me to the "Welcome" screen which says I will be redirected to the forum. However, the redirection does not show me logged in. Instead, I am taken to the original, logged off index page where I only have guest privilidges. The login fields are still visible and empty and I cannot view member only boards or my userCP.

When I do log in through the workaround of logging in first through AdminCP, I cannot log off. If I choose "log off", I get confirmation that I am logged off, but then get redirected to the index page where I am shown as still being logged in.

I have tried this on three different PC's on Vista, XP and Windows 7 with IE6 and IE8 with the same results. Clearing the browser cache makes no difference. Any advice to resolve this would be appreciated.