When raiders come I equip my dwellers with rifles or whatever weapons I have and send them to the entrance to fight, but then they just stand at the entrance door helplessly with their weapons and do nothing! As a result, my dwellers got killed despite the fact that I had enough weapons. I closed the game and reloaded it after 5 minutes or so. It helped, fortunately the majority of the dwellers were alive, although I had to pay caps to resurrect those poor ones.
My friend had the same bug and as a result all his dwellers were murdered. So annoying! Does anybody else have the same bug?