Well, thanks for those replies. My community folder is actually quite sparse. 99% is all default aircraft plus the Cessna Longitude and the Working Title CJ4 (plus some Navigraph bits and the Rolling Cache). I have double checked and there in nothing else even remotely connected with the FBW. The Installer has now been un-installed and re-installed 3 times today. The PC has been re-booted more times than I can count (fortunately I have the OS on a 1TB NVME drive and it boots up in around 20 seconds).
There is over 600 GB free space on the C: drive. All of my FS2020 is installed on a separate 1TB NVME drive (nothing else, FS only) and the is more than 525 GB free space on that.
In desperation, I downloaded a completely different airplane, picked at random on flightsim.to (just happened to be an A330). Popped it in the community folder and… that doesn’t work either! I might try another one later but I have a feeling the result will be the same. Therefore, I am now 99.9% convinced the fault somehow lies with FS2020… or does it? I have been trying to check all the community folders properties etc but as of the moment I can see nothing out of place.
Re-Install MSFS202? Format my E: drive first? I.m not quite sure how to go about such a task at the moment. By the way, it was not installed through Steam. Think I done it through Microsoft store (at least it shows up in there). But I can’t find any serial numbers or whatever might be required to re-install it.
The saga continues…
Glenn