I've come across a really strange problem with one of my scripts and I thought I'd post it here to see if anyone else has encountered something similar. I have a script that converts kml/kmz files to shapefiles with a simple GUI interface written in Tkinter. My problem is that it works fine with a .py extension, but when saved out with a .pyw extension it stalls while reading my kml files. There are no error messages and it doesn't crash. Any thoughts on what could cause this?