python coredump when using GtkAgg mode

hi all,
I installed matplotlib and it worked very well with TkAgg/Agg. But when use GtkAgg or Gtk, python just coredumped without any prompts.
For example, python a.py -dTkAgg, it worked. python a.py -dGtkAgg, “Segmentation fault (core dumped)”.
My system is NetBSD AMD64-3.0. With python 2.4.3, gtk±2.8.19, pygtk-2.8.6.

Is there someting wrong with my system? Thanks for your suggestion.

                     assiss
                     2006.8.18

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