I have this same problem. When I first built my 3D model of my floor plan layout the 3D view and 2D blueprint were showing the floor and allowed me to edit material/color. However after many months of success with this, when I upgraded to version 6.15 all I now see is grass and can't make the Floor function aufofill or free draw the floor the is missing. How do we solve this? A reported problem for 3 years with no fix? COME ON NCH!