I am using 2013 Simulation Premium to conduct thermal stress analysis. I am testing 2D design. The problem I have is that, as every time I try to add the gravity loading, the pop window says "there is no member", and the management tress get frozen and could not be opened. I have to reopen the file to accese to the setup. I could add the gravity at the case with only one part. How come there is no "member " for teh assembly case (3 parts).