I just network enabled the UFB plugin. I did not configure it on the network screen as I want each client to be able to use the UFB plugin for their own sites.
I set up the Facebook API and it connected just fine. When I Granted Extended permissions I was prompted to login to Facebook and then selected Allow.
However, UFB does not seem to recongize that it has extended permissions. Now when I try to Grant extended permissions, I get a blank screen and then get put back on the Facebook API screen. I think this is because I've already logged into Facebook and granted Permissions. Here are some screen shots.