disapearing material properties...

I have an assembly that has gone through design and modification over a
two-year period. All the components had a material assigned at the time
of original design. Calculated weight of the assembly was very close to
measured weight.
I've just found that many, but not all, components have no material
assigned at all, and of course the assembly calculated weight is
completely wrong.
Has anyone seen this?
(SW 2006 SP 3.4)
Art Woodbury
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Art Woodbury
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