If you run your script from a CMD window, does JMP produce the results and shutdown correctly? From the prompt, you should be able to do this:
The echo command just makes a very short file, then JMP runs it. I see JMP open for a few seconds, then goes away.
You can get the correct path to JMP from the desktop icon properties. Mine (above) is not the usual path. And looking back, I should look up quit() in the scripting index and see what it expects its parameter to be...
Craige