Ok guys, I think I've got a bug here.

I've got a TAYM_PLAYLIST in the root.
1) I created a sub playlist under TAYM_PLAYLIST called PLAYLIST_A, full of MP3s, by dragging the directory PLAYLIST_A into emplode fom my hdd.
2) I created another subplaylist under TAYM_PLAYLIST called PLAYLIST_B by just typing in the name in emplode
3) I moved PLAYLIST_A under PLAYLIST_B, so that I could get this structure:
TAYM_PLAYLIST
|_ PLAYLIST_B
|__ PLAYLIST_A

BUT, after doing 3), PLAYLIST_A disappears and I am left with this:
TAYM_PLAYLIST
|_ PLAYLIST_B

Notice, I had not sync-ed yet, so all I had to do was to close emplode without sync, and reopen it to find all as it was before.

If instead you COPY playlist_a under playlist_b (by holding CTRL) and then delete the original, it works.