Triforma Solids not Casting Shadows

Hi All, I am having some trouble with a particular model in which some of the elements have been imported from another software package (I am using BS v8i SS3).  These imported elements have been assigned parts and families, and the dataset assigns the materials. This all looks good, and renders ok, but I am finding that not all the elements are casting shadows.  Can anyone suggest a reason for this, or a solution?

The attached view shows how the tanks are not casting a shadow on the concrete, but the water is, and the grating is casting a shadow but not the steelwork... :(

-W

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