Well, that helps, but doesn't solve the problem entirely.

With that done, the iPod remembers where it was in the track, but the Now Playing list is still gone, so unless I know what track was actually playing when I plugged in the charger, I am still lost. However, it is much easier to get back to where I was, simply by starting at the first track of the audiobook, and skipping track by track until I come to a track whose starting position isn't at 0:00, and that'll be where I was when Now Playing went away.

Thank you for the link.

tanstaafl.