I almost forgot to ask!
Possibly related, possibly not, the only puzzling issue remaining is that, after switching to the XML playlist, I can't figure out how to play sections that have already loaded in the timeline. It's currently making people watch through the whole video (it cannot advance in the timeline and, instead, goes back to the beginning of the video when you click ahead in a loaded portion).
Previously, when we'd been using Autogenerate and Short Description, this was not an issue - you were able to skip around in the loaded parts of the video with no problem - so I'm assuming that there's a way to put this into the XML coding.
I'm assuming (though not certain) that this is a separate issue from the pseudo streaming, because my impression was that pseudo streaming allows a person to skip ahead onto the unloaded portions of the video and load from there.