Can you tell me where I find this file (steam version) and will it affect anything else im running with GSX pro
On the Steam version, the file is here:
%APPDATA%\Microsoft Flight Simulator\CONTENT.XML
Removing this file will result the sim creating a new one from scratch, with scenery areas sorted alphabetically, first the ones in Official, then the ones in Community, and this will affect the scenery priorities so, if you edited that file manually ( maybe you haven't, if you didn't knew where it was ) to fix yourself some priority issues between sceneries, you would have lost your changes so, I cannot say if this will affect any scenery or not, but it will surely affect GSX if you don't remove it at each startup or, at least before a flight from an handcrafted airport that has already replaced default Jetways on its own.
Because that's what the bug is really about: if a scenery has already replaced default jetways, other sceneries ( like GSX jetway replacement files ) won't be able to do that, even if they have an higher priority, unless you remove the content.xml file each time.