Registration page and auto-login

Hi,
I have a free subscription plan set up and my reigster link in the top menu goes directly to:

http://aiwc-lausanne.org/wordpress/register/?action=registeruser&subscription=1

Once registration is completed I want it to go to:
http://aiwc-lausanne.org/wordpress/welcome/

I set this link in the REGISTRATION COMPLETED PAGE settings
and yes, the REGSITRATION COMPLETED MESSAGE field is empty.

What it currently does is it takes to the register page upon completed registration and it show their subscription ----- and it logs them in automatically.

As i also have a NEW USER APPROVAL plugin installed I don't want them to auto-login.

Appreciating your help,
Thanks
Sascha