Ultimate Facebook - Blank Screen / Permissions

After clicking on the register with facebook on http://shopgigistone.com/wp-login.php?action=register loads a blank page and registration is not complete.

Not sure if it is related but when resetting auth tokens this error pops up.
Invalid Scopes: read_stream. This message is only shown to developers. Users of your app will ignore these permissions if present. Please read the documentation for valid permissions at: https://developers.facebook.com/docs/facebook-login/permissions