My H.o.t.s.p.o.t Button vanished after i left. So using this isn't possible.
The shelter plane button is a bit random, sometimes it appears after saving and reloading
Yea it appears that way, but it won't help here because Kaya86 seems to have a problem with saving.
I think to make a clean reinstall any leftovers in \Documents\Larian Studios\Divinity Original Sin and in \Steam\steamapps\common\Divinity - Original Sin\ should also be deleted.