I've encountered the same "silent exit" problem in a multi-threaded Python Tkinter program also. I'm guessing that the Python interpreter hits an error starting a thread, so it calls exit(), and that the thread changes in cygwin 1.5.19 relative to 1.5.18 caused the problem we're seeing. My program worked again after reverting the "cygwin" package back to 1.5.18. I can be reached at http://www.jimbrooks.org
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