All was running perfectly. I was in the middle of ground services, but I had to get going, so I thought if I hit "Disable Addon" on the P3D addon menu, it'll end my GSX session. That is an evil button.
Yes, it's an evil button, and we should have named it "Destroy GSX forever, never to return...". In fact, there is a bug, because the intended behavior is that GSX won't start anymore, but it should block other FSDT addons, and this will be course fixed with the next Live Update, this must have been slipped in testing, since we never thought someone would want to disable GSX.
The Disable button was initially designed to Disable just the Live Update, because some users were annoyed by it so, because we always hear all users suggestions, added it but, since both the Live Update and GSX are two Couatl plugins, we thought it would have been nice to give users more control, and let them disable any plugin, even it wouldn't make much sense to disable GSX...
If you want to just STOP GSX from what is doing after you started a service, you should select the "Reset Position", which is designed to do just that, NOT disable the whole program!
In any case, the next Live Update will just give a message that GSX has been disabled by your preferences, instead of panicking.