Yes, reinstalled VS 2013. But anyway, like I said it works well in FSX but not in P3Dv3.
No, in the P3Dv3 addons drop down menu the Addon Manager, GSx nor Couatl engine are present. Only the regular modules like, FSUIPC, etc.
It seems to me after all the troubleshooting that for some reason P3Dv3 either is not seeing the Addon Manager and couatl engine or is unable to load it !
. I also did a P3Dv3 Client, Content, Scenery and main P3Dv3 installer repair scan w/o any luck. I don't want to uninstall P3Dv3 and reinstall to find out that the issue persists with couatl engine, etc.