Hide Section Markers based on View Scale

To show only Section Markers on a 1:100 key plan that relate to 1:50 scale section views

Objects non-selectable for no apparent reason

This object (which was a family type hosted onto floor slab representing a pertrol (gas) station forecourt mysteriously became non-selectable 

Curved Curtain Wall

Creating truly curved wall -

Start with a basic wall type consisting single sheet 6mm glass