. Curiously enough is also seems that Chaseplane is being affected as it does not recognize that p3d is running.
Not curious at all. It confirms of a problem in the sim, which doesn't have anything to do with the Addon Manager. The most likely issue is a problem with VC++ libraries, not necessarily the ones we use, but the ones used by Simconnect which, depending on the addon, might be different versions.
The Addon Manager for P3D4 requires the VC++ 2015 libraries and it use the P3D4 Simconnect, which also use the same libraries.
The Couatl program, since it's an .exe that connects to both FSX and P3D, use the FSX SP2 version of Simconnect and it requires the VC++ 2015 AND 2013 and, even if it's not required by itself, the Simconnect client it uses to connect to the sim, require the VC++ 2005 SP1 version of the libraries.
So, basically, you need to be sure that ALL 3 versions are installed properly.
