@ chumley. That is spot on what I was suggesting. In the meantime I noticed that if loaders start to dance around when I initiate boarding or deboarding, by selecting COUATL restart or reset and then calling the same service again, it all works correctly. Again, no issue if I warp to the parking spot or if I spawn a new flight by selecting the parking space using the FSX menu. Not a convenient solution. But it all worked correctly before the latest updates.
@Umberto. I deactivated GSX2 form the addons menu and reset the jetways to default in the control panel. I then activated the "live update" icon and reinstalled latest version of GSX basic. So I think I have done it correctly and up to date. Everything seems to work with the exceptions noted in this post.
Craig