Ok, i think i know why buildings shoot away for some people i think @judas is one.
When you in edit mode, with a BIG building. you need to position your camera sometimes to click the building so you get in edit mode. but at that point when you use mouselook it happend now the last time enough that the building is moving… uhmm, running away in some direction. most it’s running away in the direction you move the camera.
Mouselook and edit mode are no friends. but you still need them both in edit mode.