Plugin issue - Anonymous Answer

Hi,

When a unregistered user tries to post an answer, he is presented with a form to enter his answer and a button with label Register/Login & Submit. After clicking this button and going through the registration process, the answer is posted but the user is not assigned to the answer. I just see no name and zero points to that answer.
Can you please tell me how to fix this, I am fine to edit the plugin code if needed.
Thanks,
Harsha