Membership Plugin and Ultimate Facebook

Hi guys, I want to use Ultimate Facebook to allow users to register for a premium subscription with their Facebook account.

The button "Register with Facebook" appears on the "Register" Page. Clicking the button allows me to sign in to Facebook and auto-populate my data.

Once I click the "Register" button it takes me back to the back to the original Register page.

When I deactivate Membership Plugin, Register with Facebook works normally.

Any help would be appreciated. Thanks.