Assuming you have the latest script and an appropriate version of Max, then all should either work correctly, or show you some kind of error message.
Can you run us through EXACTLY what you are doing?
I assume the CAS import function is working, or else you would not be able to modify a model....
check:
The model is actually a mesh object
The skin modifier has been applied and is present
You have applied a material to your mesh
All of these should produce error essages if they are not properly done. To have NOTHING happen implies the script is not running
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