If you are underage you can not sign up for an account due to the fact that the hidden email field is required, but no field or error message is displayed. It shouldn't be required when it's not visible. Worked around by adjusting age and showing the email field, filled in a phony address, re-adjusted age to correct age and then submitted.
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Thanks for reporting this. We cannot collect email address from people younger than 13, therefore the e-mail field is hidden in those cases and it should not fail if you do not input email. I have tested it in Firefox and Internet Explorer 6 and 7. What browser and operating system were you using?
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