as you can see my issue is slightly different to all the "missing building" threads.
Well, it's not "slightly", it's entirely different and doesn't have anything to do with it.
Missing buildings are caused by our software not running (99% of the times, because of the antivirus, 1% because of corrupted FSX/Simconnect installations) so, buildings that are created on the fly by it, are not visible.
Jetways, instead, are not handled by our software. They are inside the AFCAD file, and handled entirely by FSX. In fact, if our software is not running, you would usually see JUST THE JETWAYS.
So, in your case, the most likely cause, it's another AFCAD coming from another product that is in conflict, and is excluding part of our own.
They are mostly found in AI Traffic Packages (like My Traffic) which means, you need to identify if there are any other AFCAD for Geneva in your system, and remove all the extra. You should have 2 AFCADs files for Geneva, at the most: the Stock from MS, and the one from FSDT in the fsdreamteam\LSGG folder. If you have more, remove them all.