For example, I think I used OpenID to log in, but I might have used Google instead. I don't know which. I tried to log in from home, and I got the cryptic "Bad OpenID error". I don't know if this meant OpenID was down at the time, or that I was using the wrong provider. There was no way to request an email with my login credentials, not even to my already entered email address.
Even from my work machine, where it remembers I am logged in, I cannot tell if I have a real account or if I have used one of the many OpenID providers. So I still don't know if I'll be able to log in when I get home.