Very same problem here. Location or aircraft doesn't matter. The crew bus will stop 10-15 meters behind the airplane and then gsx hangs and the menu is not working anymore. The audio from the bus is still running. When exiting p3d, couatl.exe process hangs and i have to kill the process manually. I've tried this on LIML and some other default airports with a Beechcraft 390 and a Fokker F50.
However, it happens only if the plane is not configured in the editor, if you edit an entrance then it does not hang.
I did not buy L2 either but now i can't board planes anymore with GSX without configuring an exit/entrance first, otherwise it hangs. In the previous version this issue was not there.