I have not seen this before. Hmm.. A few things to check/try:
1.Check to make sure your email address is filled in My Settings and is not N/A.
2.If it is you may have to change it in the management interface.
3.If it is correctly filled out, try to clear your browser cache and navigate back to the site.
4.Any strange characters or spaces in your email address?
5.Try re-saving your email address.
If these do not work and you have your email correctly filled out can you recreate this?
1.What is your permission (unverified email user, user, employee, amin?)
2.Is this multiple users or only one?
3.What version are you on?
4.What browser are you using?
Hope this helps!