User Registrations

After installing this theme, users are unable to register for an account. They go to and see the normal wp-signup fields, such as name, email, username, blog path, etc but when they click complete sign up they are redirected to the same page again.

I am using WPMU 2.9.1 - BP 1.1.3 - BP-Social Child 1.1.2 (BP-Social 1.2)

I have completely removed all plugins and mu plugins from the site to troubleshoot, and get nothing.

When I switch to another theme, Default, etc, I see the regular wp-signup.php form, and am able to register, this problem only exists with BP social theme.

Problem exists in all browsers too.

All help appreciated.