Ah, thanks.
That means the problems are due to limitations in librsvg's
implementation. We'll move forward with that info.
Oh, and in case anyone is wondering, I do know that the few people
working on librsvg would be very welcoming to any coding help. So
feel free to lend a hand.
Well, armed with the knowledge of where the problem was, I downloaded and
installed the latest rsvg and the toolbars now work! I should have thought
of that earlier, I guess, but that's always a problem with dependancies.