Hi Bert,
Something else to try that might help is ...
1. Go to the Leadsheet view.
2. Click on OPT (#1)
3. Deactivate AUTOSET CLEFS (#2)
4. Activate which clefs you'd like to be present (#3, #4).

Yes, I already tried that, Noel. It seems that's a global adjustment that affects all parts. It's seems like it's an either-or proposition. Either treble OR Bass Clef on ALL parts. It looks like you can't set one for one part and the other for another part.
Thanks.
Regards,
Noel