Membership and Ultimate Facebook not playing nicely together

Hi guys,

We're using the Membership plugin to setup tiered access to our premium content.

We'd like to use Ultimate Facebook to allow users to register for a premium subscription with their Facebook account.

Ultimate Facebook is fully configured and mostly working. The option to "Register with Facebook" appears on the "Create an Account" screen. Clicking the button allows me to sign in to Facebook and auto-populate my data. I can then fill in the captcha and "Register".

Clicking Register on this screen takes me back to the beginning of the process, back to the original Register screen where I can choose a subscription level. {slams head on desk}

Am I missing something?

Thanks for your help!