Hi talghe
I'm not with Laminar Research, just a fellow simmer in the UK.
I have looked through your XP11 Log.txt file and noted that you have the following addon FlyWithLua scripts:-
1. G:\Program Files/X-Plane 11/Resources/plugins/FlyWithLua/Scripts/X-Visibility.lua
2. G:\Program Files/X-Plane 11/Resources/plugins/FlyWithLua/Scripts/shadows_fix.lua
3. G:\Program Files/X-Plane 11/Resources/plugins/FlyWithLua/Scripts/CloudArt.lua
Personally I do not have these particular scripts installed in my copy of XP11 and have never experienced the type of problem that you have, in all of the time I have been using XP11.
I would therefore suggest that these files are temporary moved from the G:\Program Files/X-Plane 11/Resources/plugins/FlyWithLua/Scripts folder and saved somewhere else for the time being.
Then try opening XP11 once again to see if you have the same issue?
If not, then load each script back in one at a time, to see if you can identify which is causing the problem?
Hope this helps.
Regards