Gentlemen,
Don, I am not working in an assembly. I have one part that I want to run comparative analyses to see my differences. I have tried assigning in and out of Simulate Lite.
Charles, I have tried all that you have suggested. Assigning and un-assigning both in and out of Simulate Lite does not give me any love. I can get to the Confirmation Window you have shown above, answer yes to both prompts and the material will not change. The only thing that has "worked" is I have gone as far a deleting ALL the materials AND the constraints AND the loads, save the model, exit (Creo2, by the way), come back in and assign the material I want. That is no solution but the only thing that seems to work.
And, how did you guys get "Correct" answers to my post before I responded? Isn't that up to me? ;o)
Thanks for the suggestions.