Just a few minutes ago, I found I wasn't logged in, but apparently was not logged out either. Any time I clicked on a "log in" link, it took me to the "home" page where you see how many PMs etc I have, but it still said "you are not logged in":
Clicking on the "log in" link on this page just caused the page to refresh. I couldn't find anywhere that would let me actually fully log in so I could post, nor anything that would let me fully log out so I could try to actually log back in, until I tried typing
http://forumserver.twoplustwo.com/logout.php into the address bar (which brought me to a login screen)