ok, for a better comprehension i'll make a small chronology of how the problem developed:
1. i bought KJFK one day after release
2. multiple couatl.exe on task-manager and not closing after ending of fsx.
3. your first fix didn't solve the issue as posted.
4. applied your newest build, which you just today released, involving two files, which need to be copied in specific folders inside the Couatl folder.
5. the problem with mutiple couatl.exe seem to be solved, as i see no more new couatl.exe apps in the task-manager. in addition, it seems that couatl.exe ends now much faster together with fsx. i even recall to see that it closed faster than fsx does, which is good especially when restarting fsx very quickly
6. i realised that after applying your newest build, no more ParkMe boxes on the gates and no ParkMe menu or YouControl menu available.
to me, it looks like one issue solved, one new created
i hope that helped a little.