Edit mode vertices getting dragged? Blender 2.79: I have this problem in edit mode, when I try to move this vertice, it keeps getting dragged away for some reason. I'm trying to create a corrective shape key for this area, the mesh doesn't have any, but with this problem, i can't create it.
I fixed the problem, the issue was that the weight painting of the shoulder and the thorax was intersecting a little bit with the arm weight paint, and caused the vertices to get dragged when posed like that.