Once again, you are accusing me of doing something I did not do! I have never said nor indicated I have ever edited the xml files. The only files within P3D I have ever edited have been P3D.cfg and Scenery.cfg, and these were limited to minor tweak in P3D.cfg and turning off scenery in the Scenery.cfg.
Also, if you recall, based on your recommendation, I upgraded my P3Dv3.3.5 to v3.4. My P3D v3 install originated at v3, and has been upgraded from there.
I have had the following FSDT products for P3D beginning in 2014 and as the newer have been introduced (GSX, KORD, KDFW, KJFK, KLAS, PHNL, KFLL, KLAX, KIAH, KMEM and latest KCLT. Would any of these in the past have added the entry? There is a back up copy from 2016 that is named dll_xml_Before_Addon_Manager.xml, there is also the exe_xml_Before_Addon_Manager.xml, so I am assuming at some point when I installed an FSDT product or the Stand Alone Manager it made these changes and most likely put the entry in the dll.xml file.
This is why I offered to send you the files to review to determine if there was an errant entry issue or something causing the problem. Nevertheless, should I remove the Addon Manager entry from the dll.xml file and should the exact same entry go into the addon.xml?
Edited to add question.