Greetings from Korea!
I have the same problem with him.
My sim is P3D v5 Hotfix 2, and yes, I upgraded my SODE version up to 1.7.1.
When P3Dv5 HF2 released, I Clean-installed my Windows and P3D newly, and my language setting for non-unicode programs is English,
I also ran the FSDT Live update for my last version of P3D.
so normally there should be no problems with GSX.
One notable thing is that, if there's a custom SODE Jetways by Scenery builders, Jetways acts normally,
Problems occurred only when I tried to Connect GSX Jetways in Default and Addon Airports.
So, I think that it's GSX originated problem, so check for it please!
I added my Screenshot, with the message, "Sode connection lost!"