Hi John. I certainly understand that if some other developer's ACARs program isn't working right that it would be hard for you to even investigate. If it was only one program, I would agree that it's gotta be the ACARs program. But in this case I'm up to 3 different ACARs programs and none of them are seeing FSUIPC. The programs in question are GCP from Globe Cargo, Merlin from British Airways Virtual, and VAS ACARs from the Virtual Airline System (there are 3 alliance VAs that all use this same program).
I did Windows tech support for many years. I know a lot of "tricks of the trade". One such trick I just tried. It's very reliable. I uninstalled FSUIPC 6, rebooted, deleted any folders left over, then installed FSUIPC 6.20 but changed the default install location to a location of my choosing. This "trick" almost always works as it forces Windows to treat it as a new installation. It did not work this time.
Do you happen to have a version of FSUIPC 6 that is older than 6.19 that I can try? Maybe that will fix it?
Thanks for your responses and support.