I did some more investigation after reading that thread and found that I had overlooked something very important.

In JEmplode, I always copy the Artists/Albums Soup list and paste it as a Playlist. This was the first time I did it since using JEmplode 44. It created all of the lists in hierarchical order, but all of the individual songs are missing.

So, I've got the whole structure (Artists and Albums), but the Albums are empty! Does this feature no longer work in JEmplode? What have I missed?