I created a separate project to test it, and it’s working fine.
In the original project, I had forgotten to select all the notes, before resetting playback overrides. However, when I do that, the notes in the SCORE shift in time, mucking it all up. So I guess that’s a clue as to what’s wrong?
Before I provide the score, allow me to read up on how to submit copyright material - I’m doing an arrangement of a copyrighted song. (I recall seeing it mentioned somewhere). Either that or I’ll try to strip out as much as I can to reduce the risk to zero.