I initially experienced this in the Asobo Cessna 208, then I tried it in the Carenado Skymaster, then finally in the Asobo 172 G1000.
When I started my computer this morning, and all of my peripherals, the Logitech Flight Panel was dead. No lights before or after MSFS is running.
I restarted (cycled the USB port) for the panel and the lights came on, but randomly. (not like the test) Display showed HDG and degrees…then HDG lights went off, and just showed degrees. Then back and forth slowly . Same behavior when switchng to ALT or VS.
If I fly a plane without autopilot, the behavior is completely normal. If I unplug the panel, and fly a plane using autopilot, the behavior is normal. And the final clue. When I use the flaps up/down switch, it is glitching…sometimes working and sometimes not, seemingly at the same times the panel is glitching.
So, it is a problem with the panel.
I think the simplest solution might be the easiest. SO…here’s the embarrassing thing. I was using a USB to USB extender cable because my USB hub was JUST a little too far away. I unplugged the extender cable and plugged directly into the hub. All the problems went away. I suspect the extender cable or connection had gone bad.
I thank everyone for their input here, but hope this post might help someone else save a bit of time.