Yes. I did "python log_demo.py", got the gtk GUI and clicked
> on the "save" icon to produce the eps file. So it is as you
> said, it comes from the GUI backend. No warning when I did
> "python log_demo.py -dPS"
OK, now we at least know where the problem is. I don't get such an
error message on my system (rhl9, pygtk-2.0.0). What platform are you
on, and what versions of GTK and pygtk are you running?