That's it! Thanks guys, the signifance of the tiny eye icons with the little stroke through them was lost on me. I have no idea why they all defaulted to scanning disabled - that seems like a dumb installation default for a media program. I clicked them several times, as I clicked everything I could see, but I didn't notice them changing (and it doesn't seem to like any of my avi files, so no playable video media were found anyway the one time I accidentally got it to scan the removable card).

I still can't get it to see my UPNP server though. Does Canola2 support UPNP servers?