Assuming the penguin with a '?' in the user profile means the user is online, I get a strange behaviour here.
http://bayimg.com/oaggFAABC
It says I'm online/logged in when clearly I'm not.
I don't think it is a cookie issue, because my cookies and all saved info get automatically cleared when I close Firefox. Besides, I get this on a freshly started system. Just brought to your attention.