Facebook Signup Not Working, says user registration not allowed

Hello, i'm trying to get Ultimate Facebook to work on my multisite...
Ihe button on me /register page does not work, and when i use the one on wp-admin, it gives an error message "User registration is currently not allowed."
I have user registration active on my network, i tried disabling your Signup TOS" plugin and disabled "ANti Splog" since these plugins affect the signup process ...
Didn help
Could you please take a look at my site?
Thank you

The wpmudev page that is supposed to help configuring the facebook app is not loading images by the way...

Thanks