This is usually related to the issues below but if it is not please contact us, we are usually able to fix any issues within a minute or two of investigating.
Password/Email issues: If you have forgotten your password please use the 'Forgot Password' link. This will email you with instructions to reset your password. Please check your spam filter if you have not received the email. Is it possible the email address we have on file for your account is an old one that you no longer use? In that case, contact us and we'll update your account. In November 2010 we changed our website to a different platform. If you had an account before that date and have not been back since your old account is no longer available. Just create a new account.
Sometimes browsers might need their cache clearing, 9 times out of ten if your restart your device if fixes the issue.