Thanks, squeezy! You are right, I have added software, done a lot of updates over the last few weeks, all that, so it would be better to just update the Xfce. The idea occurred to me to update what I have, too, but I didn't want to make another post in this thread, as I have made a mess of it already (now that I have bumped it back up to the top, I think I will delete that link I posted up-thread, too). However, your directions have made it far easier for me, would have taken me some work to figure it all out, I think! If this weren't my stable, perfect system, I would probably build it from the fat tarball from the Xfce site, just for the experience, but I don't want to break this install. Maybe I'll install a second Mint on my experimental drive, and play with building it there.
Thanks so very much!