walls not showing in elevation or isometric views

I am using autocad architecture 2009, I have a drawing that will not show the walls in elevation or isometric views.  What is the switch?  I have other drawings that will show these walls in 3D.  I have even tried to import a wall that I now will show up in 3D in the drawing that shows all correctly into this other drawing and this wall will not show up in 3D.

The drawing has something turned off, what and where is it?

thank you.

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