New User registration redirect error

For the Q&A Plugin I have settings set to: After a Visitor Submits a Question: he is asked for registration.

So a new and unregistered user asks a question and then is prompted to register at wp-login.php?action=register.

Right now, when that registration is successful, the new user is redirected to a specific and outdated URL (from a former QA plugin, now deactivated but not deleted). And the question form is lost, and the question content is lost too and not posted. How do I resolve this breakdown in my new user/registration process? Thanks.

I thought to use your Register Redirect plugin, but I still want the dashboard for my Admins, and more importantly, I want to save the data, the question, in the form the user just sent before the registration prompt.