I actually have the same problem, here is more information:
- if all fields ok, redirected to the login page without message "please check your email for a confirmation link blabla". But email is sent and registration is ok.
- if one of the fields is not ok, redirect to login page without any error message. So the user does not understand.
Nok fields includes wrong capcha, password mismatch or even a strange thing: a dash in password.
i am trying to troubleshoot it but if someone has quicker solution ... welcome