O.K.-Really fundamental problem here.  The pre-processor stops at "constituent control cards" and stops with a Visual Fortran run-time error saying "forrtl  The handle is invalid."  I am trying to run a model with just hydrodynamics and temperature, so I have OFF under CCC in the Constituent Computation card.  However, the model keeps stopping at constituents, like it is looking for them even though I have turned it off.
I think my fundamental problem is that I can't save any changes through the user interface, so I have been saving my changes on the text control file.  Is it possible to edit in the user interface?
I am using version 3.1.
Thank you so much![addsig]
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