viz renderer /acad2004adt

I've been using ACAD for a long time and 3dstudio max also.
I've just purchased acad2004adt.
I tried linking a acad file into its viz renderer.
Am I being dumb or something...... Thickness attributes of lines don't seem to be linked into the viz renderer. All my walls become flat. That's crap!!!!!
Can I change this??
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seem
Walls created as ADT objects? They are 3D for me when I bring them into Viz Render.
Is the entire drawing in 2D, or just the walls?
Matthew
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All lines with thickness attributes become 2D in Viz Renderer. 3dfaces are OK.
I'm not a great fan of ADT. I prefer to model surfaces and polygons, rather than ADT objects. I don't even use solids very often. If I'm modelling buildings, I very often simply change the thicknesses of lines (plan) to get walls.

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