I can report that with the Speed-up option OFF, the 4 bar JukeBox exercise got through 231 of 233 songs in a folder, without hanging, but it stopped with piece 231 open.

There were two sets of "Large Lyrics" on the screen at the time (I'd previously noted that persistence of Large Lyrics after a song had been closed was a feature of the exercise), so clearly there are circumstances where these aren't shut down with the song itself.

BIAB is able to play piece 231 in the normal way, and it shouldn't have been too challenging, as it only used RealDrums and MIDI - no RealTracks. Piece 232 was all MIDI, and piece 233 was RealDrums and MIDI, and played through without trouble.