Okay, so I uninstalled GSX and AddonManager and re-installed everything.
Unfortunately, the problem persists.
I believe that after the 1st run (after LiveUpdate, where everything works), GSX apparently won't start properly. I didn't notice this at first but let's forget the catering/resetting etc. for a second.
Here's what happens:
- 1st run, everything's OK. In the top menu bar under "Add-ons" I have "Couatl settings", "Couatl Live Update" and "GSX". All good & working.
- Quit P3D normally.
- 2nd run, GSX now unresponsive, in the top menu I now only have "Couatl settings" and "Coutl Live Update". ... "GSX" is missing (as seen in my video as well).
Nothing I do (reboot, restart etc.) will bring the "GSX" menu entry back from this point on. So "something" is not starting anymore after the 1st run, for whatever reason.
Any ideas?