Mike,
I see what you mean. I simply "Save as" from Inventor 5 to generate the IGES versions of my models. No tricks really, I just take the default settings.
When I open these files back into Inventor, I see the model but I cannot change any attributes such as color. Hmmmm
I wish I could help you more but I don't use IGES in any of my day to day work.
Ed
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