I just upgraded my AF-5500 to version 10 of the operating system. During flight I could not engage the AF-Pilot using the AF-5500 buttons. I was able to engage the AF-Pilot using the EFIS button on the autopilot head. I checked the system settings and they appear the same as before the new operating system installation. What should I check to reinstate autopilot on/off control from the EFIS?

Thanks,

Greg