Nigel,
When I try to login to your site with Facebook, I see the following message:
This app is in sandbox mode. Edit the app configuration at developers.facebook.com/apps to make the app publicly visible.
The sandbox mode is the one setting that we are unable to update in Autotune. Please go to the
Facebook Developer Area
and update your app settings to disable Sandbox mode. That will hopefully get you going.
If you still need assistance, just let us know.
Thanks,
Alex