XF 1.5 Upgraded from xenforo 1.5.2 and registration not working


We've upgraded to xenforo 1.5.2 and now our registration form is not working even tho all the correct fields are entered.

I just keeping getting this error even tho all requirements have been met and we can see our registration count since the upgrade has dropped. any ideas?

Please correct the following errors:
  1. Some fields contained unexpected data. Please try again or contact the administrator.
  2. Please enter a name that is at least 3 characters long.
  3. Please enter a valid email.
  4. Please select a valid time zone.
  5. Please enter a valid password.
  6. Please enter a value for all required fields.