I was working my way through "Writing a GUI with Python", Chapter 13 of "Beginning Python" (Peter Norton et al., 2005) using Glade 3.4.3 and pyGTK 2.12.1 on Windows XP. However, I was unable to get any of the Glade examples to work. The expected windows just would not appear. There were no error messages, and breaking into the program while it was running in Idle showed that it was in the gtk.main() loop as expected. I eventually worked out that I had to go into Glade and explicitly set the main windows Visible property to 'Yes' (see under the Common tab) . Only then would the windows display as expected. This need to set the Visible property seems not to be mentioned in "Beginning Python" which is based on Glade 2. Maybe it was introduced in Glade 3?