Hi Bob, sorry! It's way up in the thread so here are the versions. I can take over engagement with AP if that will help- you can give them my email address for direct comms or joint email if we should take this offline.

AP V2 v5.30.09
APCC Pro v1.8.0.9
AP1600 GTOCP4 Firmware VCP4.P01-13 Encoder A01-13

I've uninstalled and re-installed the AP V2 and APCC Pro as part of my testing. I've also re-installed the mount firmware, including the encoder firmware, just to be sure I didn't make any mistakes on those installs.

On a related note, I wasn't able to test last night on C/2019 Y4 due to clouds. I'm hoping for clear skies tonight.