I changed where the forums are located earlier today.
They were at
http://www.chiefdelphi.com/forums/
Then with vB3, I moved them to
http://forums.chiefdelphi.com/
They are now at
http://www.chiefdelphi.com/forums/
I changed them back to hopefully preserve any bookmarks that you may have had.
So anyway, you probably got logged out when I (sneakily) moved the forums.