Email from Richard B:
There is a M20R json file that controls both of the Ovations but not the Acclaim M20TN. Since i fly mostly the M20TN, I never noticed that I couldn't control any autopilot comment using PC with the Ovations. But in testing today I found that error. The cure was to rename the M20R json file so that PC couldn't find it. That way it would use the PC default which has always worked on the M20TN. Voila. I previous fixed the TN version by renoving all AP commands from it's json but it seems to work fine with the default.
Email from Richard B: