I start by building a linear staircase, in this case a big one, with 25 steps, 300 units wide, height of 25.Once is done, and I move it into position, I realized I have one grid unit off, so I try to vertex edit last step to no avail. No vertices can be edited. Same happens with Pen tool and Create Convex Polygons. Create Convex Polygons feature has to be removed in order to create a Pen solid that can be edited. That’s what I’ve found, at least. I’m using 4.2