Today we had some issues with our login server. It is likely that you will need to request a new password. Passwords are encrypted on the server so we do not know what they are (and the reason you normally need a new password should you forget it).
There was an attack on the website trying to break into the system through the New Password function. This caused an issue where user entries with no email caused an issue with the password table. Unfrotunately the easiest and safest way was to remove all passwords.
Sorry for the inconvenience.