Material renders differently on projected solid vs projected B-spline solid

Hello, has anyone experienced a material rendering differently on a normal projected solid compared to a solid that was projected along a B-spline? I projected the same complex shape profile, once as a simple orthogonal solid, and again along a B-spline path, only to get two different results when rendered with luxology. The material is Galvanized steel, with no modifications, just as delivered in a standard install.

This is the first solid (simple projection) where the material displays correctly:

And this is the second solid (same profile projected along a B-spline path) where the material gets smudged on part, but not all, of the solid.

Is there a way to fix this? I've tried several different methods of projection (including as a surface & then thickening) but they all give me a variation of the same incorrect result. I need both solids to display the same, as they will used in the same animation.

Thanks for the help,

Kevin

MS 08.11.09.829 Win 7