Login is supposed to be your username, not your email. Unfortunately it seems browsers want to put your email in the login field by default instead.
This happened to me and pretty much everyone I know who signed up. Change it to your username and you should be good to go. :)
YEAH a password reset did the trick. Maybe I typoed the first time? Who knows. But all signed up, hooray!
I tried that, too.
Today it's possible I forgot the username I chose, but that first day I tried it both ways and wouldn't have forgotten it then.