Hi Master, couldn't download your file but your tip solved the problem. No Orbx file was overwritten because everything else, except ORBX, is isolated from the P3D main folder... or sort of. Almost every non-Orbx product has its own folder for effects, textures and so on and for that I use the CFG files (Texture.cfg, Effects.cfg, SimObjects.cfg, etc.) located in "\ProgramData\Lockheed Martin\Prepar3D v3". It takes more time installing things but I can isolate problems, like this one, when they appear. In a matter of minutes I found out who the culprit was. I could PM the files if you are interested (only 2).
Anyway, could you kindly tell me what was inside "fx_YMML2_orbx.zip"?
And sorry for taking your time and patience.
You can mark this topic as RESOLVED.