I clicked "install" (for the Ultimate Facebook Plug In) via the WPMU Dashboard under my Network Admin Panel (using the WPMU DEV > Plug Ins button.
It didn't install and the Install button turned into an Error button.
I've installed many other Plug Ins with no problem. Am I missing something obvious? (IE perhaps I have to install via the Dashboard of a specific site in my network?)
** Note, the drop down for support didn't have Ultimate Facebook listed as an option in it.