Another Grant Extended Permissions problem

I did some searching but didn't find anything that helped, so I'll apologize in advance if I missed something I shouldn't have.

WordPress 3.2.1 Multisite, running Ultimate Facebook 1.5.1, trying to work the settings on a single subdomain run with domain mapping. Tried Chrome, Firefox and Safari on Mac.

When I click the "grant extended permissions" link, nothing visible happens. In Firebug Console I get this error:
h is undefined
[Break On This Error] FB.provide('',{ui:function(f,b){f=FB.c...onent(FB.UIServer._resultToken));}});
all.js?ver=3.2.1 (line 22)

Any suggestions?