Deleted, and I can confirm it has reset my settings, but to no effect to the problem itself unfortunately.
I'm sorry but, you are the one and only ever reported this problem on P3D. It only happened on FSX and, even there, it was never a GSX problem and it was fixed in 100% of the cases in one of the way I already indicated in my first reply.
That's why I assumed you used FSX, since in several years GSX is out, nobody ever reported this in P3D so, clearly, something must be wrong in your installation. You can try uninstalling and reinstalling using the Full installer, most likely the separate Client+Content install didn't go well.