Nothing has changed in how jetways are handled since the SU12 update came out.
Restarting couti doesnt help.
This is the sure indication the problem doesn't have anything to do with GSX. If something is solved by restarting Couatl, it's usually IS a GSX problem but, if it's not, it means there's a problem with the simulator itself, most likely Simconnect started to behave erratically, due to having reached the maximum Simobject limits somewhere during the flight, or a the arrival airport.
If Simconnect reports bad data, or not at all, about jetways, they won't work and if the problem is only fixed with a simulator restart, you can be sure it's a Simconnect problem, not GSX.