Arrow 3 GNS 530 breaks AP functions

[FSF_UK]

Having the GNS 530 selected breaks several autopilot functions.

1. GPS course isn't followed.
2. Turning on AP or turning on HDG both lock up the trim (which can usually be freed by toggling VS HOLD on/off).
3. Roll knob makes > rate 1 turn, no matter how little/much the knob is turned.

Working Title advised us a long time ago to remove their addons as they were being incorporated into the default sim avionics so maybe still having it in the aircraft causes a conflict?