Ultimate Facebook Register Problem

Hi guys,
So when i go to register a new subsite via the facebook register page. It creates the website but just loads a blank page after the initial sign up. Hard to explain - test it out if you would like - register.bandhouse.me

I've narrowed down the problem to be one plugin.
I'm wondering how this plugin could even conflict with this register process as i don't have it network activated and i don't have it activated on the main site?
I've even tried to use the Plugin Organizer plugin to make sure it's turned off on all of my main site pages. Still the same problem?

Any ideas guys?