Resurrecting this in hope of getting any more information on this since it also happens to me. If I disable SSL, I can't log in to the web gui. Everything else works fine. Only way to get it back is to edit /boot/config/indent.cfg and set USE_SSL back to "yes" and restart the machine. Going to leave it on for now but I would rather turn it off. Edit: Switching over to a different browser works. I tried clearing all the cookies in my first browser but that didn't work. Will try to go deeper in cleaning existing state...