Now been over 48 hours and I've run the update installer more than 15 times (last time was 17 minutes ago). I am still having issues with certain items.
Your problem was THIS one:
the jetways marked with "Higher" in the title. They show up when selected and applied in the Customization but when you click on "Customize Jetways" the jetway disappears leaving the Bridge and visual options
And ALL my further comments about possible issues with Live Update were related to this problem ONLY, because these are the most recently released models which weren't present in the initial release, so you *might* have Live Update issues.
Now, in this new post, you don't say anything about the "higher" jetways so, I assume this IS fixed, is it ?
Now the issues is if I add a 2nd jetway using JBT Aerotech AT3 Three-tunnel Crystal, they will not recognize door L2 on the PMDG 777 (test and setting for heavy spots). However, if I leave everything exactly as is, but change Jetway 2 to ThyssenKrupp Apron drive Three-tunnel Crystal, it works perfectly fine.
You are now reporting an entirely different problem, which doesn't have anything to do with Live Update, and maybe you should open a new separate thread, named "some jetways don't resolve", since this one was about some jetways "don't show", which SEEMS to be fixed now, as I've said it would, by just waiting for your Live Update server to be updated.
Jetway cannot magically resolve any airplane, any door, from any place at any position, with the airplane parked in every possible position and they are not identical: if a ThyssenKrupp model resolves, it's not guaranteed the JBT will solve too.
It's not possible to say for sure if the jetways are a problem, without a proper description of the problem but, instead, I think it's easier if you just post the .INI file for your airport, so I can check it out.
Edit - After closing the sim, rerunning the update installer and reloading the sim to the exact same spot, no longer does Jetway 1 as JBT version resolve to any door. Seems every time I run the installer, I lose something else rather than gain anything.
Sorry, but this is plain impossible could be caused by the Live Update, which at this point hasn't changed any files, since you are surely fully updated by now. The only thing that I can think of, is some kind of issue with SODE (SODE is the think that makes jetways "solvable" or not), between two separate runs of the simulator, and you are mislead thinking it has something to do with Live Udpate, just because you ran it in between.
Maybe you open / closed the sim too quickly between sessions, and this could cause a problem to SODE. Have you noticed how much time it takes AFTER the simulator icon has disappeared, for the "Compile" button in the GSX Control Panel to become active ? This is the same time when is REALLY safe to start the sim again after closing it once, because the GSX Control Panel ASKS Windows when Prepar3d.exe has closed, and this can (and it DOES) happen several seconds *after* you see its icon disappear, so you might be tempted to just starting it again.
Another possible issue is: where you in the exact same position when you customized the parking spot ? GSX and the simulator use a different method of positioning the airplane.