New Radio transmitter - throttle control only available in manual, not FBWA, LOITER, AUTO, etc

I have been using the same Spectrum Dx6i for years. Upgraded to a newer Spektrum 6 and ran through the calibration routine in Mission Planner.

While flying today, everything worked fine (ground control, auto take-off, waypoints) except that when I switched into FBWA, I had no throttle control from my transmitter. All modes except manual had all controls EXCEPT throttle.

Any ideas?

Thanks.