Good morning, if no one has ever reported the problem it doesn't mean that it
doesn't exist
If the problem existed, it would have been reported by somebody else so, the most we can say right now, if that it exists only on your system so, since you said something that is should be so obvious that everybody would have noticed it by now ( you said it happens everywhere ), the only possible reason I can think of is some kind of failure to either install or update GSX so, the usual suggestion is:
- Turn off the firewall
- Configure the antivirus to add the whole Add-on Manager folder to the antivirus Exclusions list.
- Launch the FSDT Live Update again.
If this doesn't fix it, it's *possible* your issue is caused by using an AI traffic product that uses AI injection with too high settings, so you reached the maximum limit of objects in the sim, which results in objects randomly disappearing.
This is a known problem that is obviously not caused by GSX, but it's a limitation of the sim which has been more apparent only after several popular AI traffic product has appeared, and can be fixed by reducing the amount of traffic injected.
From GSX, if you are on default airports, it might help unlicking the "Ground Clutter" option in the GSX Config panel and run another update, so it will download a more lightweight version of the jetway replacement files which won't contain any more objects than the default scenery they replaced, which will help by containing the number of objects in the scene.