gtk segmenation faults

[Franz Steinhaeusler]

Hello, I have a strange problem running a wxPython program:
On Windows XP, everything is fine with wxPython 2.8.1.1 Unicode.
But the same wxPython version causes troubles with certain tracebacks.

Goolge cannot help me out, so I ask here.

        ** (python:5936): CRITICAL **: gail_menu_item_ref_child:
assertion `(i >= 0)' failed
(then segmentation fault occures)

or
          ** (python:12488): CRITICAL **: gail_menu_item_ref_child:
assertion `(i >= 0)' failed
          Segmentation fault (core dumped)

or
          ** (python:12542): CRITICAL **: gail_menu_item_ref_child:
assertion `(i >= 0)' failed
          Segmentation fault (core dumped)

      
a) How can I trace back, what a segmentation fault caused?
      
b) What does that mean (gail_menu_item_ref_child: assertion `(i >= 0)'
failed)?
      
c) What do the numbers 12542 and 12488? Could this numbers be useful?
      
d) What is the best way to debug or isolate this to a certatin piece of
code this?

Many thanks in advance!