I can't use SSH, the connection closes immediately.

I have a paid account and should be able to connect using SSH. Below is the console output when I attempt to connect with the bash shell in Debian Squeeze.

buttons@debiandesktop:~$ ssh
<<<<<<:>~ PythonAnywhere SSH. Help @'s password:
Last login: Mon Oct 29 01:44:17 2012 from Mars
Connection to closed.

It appears I can connect, but the connection is immediately closed. I know my password is being accepted because I get a very clear "Permission denied" message when purposely using the wrong password.

It's a case thing. Your username is Buttons840 (with a capital B).