I'm so relieved that nobody else has my problem, I must have misunderstood other posts.
The evidence I provided in the form of screenshots do help to explain what's happening, as they say a picture paints a thousand words. So I can't see why you feel they are offensive, it was being used to explain my situation, admittedly I should have included the log as well, which was an oversight on my behalf.
I have gone through all the previous steps as before to see if I can replicate the problem with the add-on entries disappearing and none of the GSX menus coming up in P3D and the results were the same. I would like to say that prior to around about the time of the MSFS release everything was working perfectly and had been for years, it only all went wrong when I ran a live update.
Over the years I have updated P3D and GSX on multiple occasions and this kind of thing has never happened before it has always been straightforward.
Since then I have completed multiple uninstalls and reinstalls of GSX but cannot get it to work, I do have MSFS installed on my PC but am not using GSX with that, only P3D. Nothing else on my system has changed since GSX was working properly.