NPC Settlers placed outside of settlement area, can't command and they wont budge. Have to kill them pretty much.
Radiant Quests for Settlements wont complete no matter what you do, force fail when leaving area.
NPC Settlers don't seem to recognize door ways and wont go inside buildings where beds are, leading the system to think you have no beds.
Overall NPC Settler intelligence is that of a hotdog. They wont move around an object if it's in their set path to walk.
To me, the main part of this game was for the Settlements, I was wore out with the whole fallout concept already. Add the countless quest bugs on top of these, and this game is completely unplayable and is soon to become a dust gatherer.