[Plugin: Peter's Login Redirect] Post-registration redirect not working

I am using this plug-in for the wonderful re-direct upon log in, which is working great. But I also want to use its feature of re-direct after registration, and it doesn’t seem to be working.

My site is here: http://friendsofwildlifecamp.org/
Most of my users will log in on the main forums page: http://friendsofwildlifecamp.org/?page_id=93
Most will register on the Registration page: http://friendsofwildlifecamp.org/?page_id=103

On the Registration page, after they click the “Register” button, I want them to be redirected to this post-registration page: http://friendsofwildlifecamp.org/?page_id=157

I’ve put this “post-registration” page URL in the Post-registration URL box of the plug-in, but when I’ve tested it, after clicking “Register” I just get redirected back to my main forums page.

Advice?

http://wordpress.org/extend/plugins/peters-login-redirect/