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Bruce,
I'm thinking that your model must not be located at 0,0,0. What are the X,Y, and Z co-ordinates of the c-system that you placed in the center of the model? I'm thinking that you may have to relocate the model to 0,0,0.
Bruce,
Have you checked the model size (Info>model size)? It sounds like the bounding box is much larger than the actual model. This can happen when datum features are created in the model that extend much farther than the model itself. They're turned off or hidden but the bounding box size remains large enough to contain them. HTH.
Rich