segmentation fault when unpickling an object in another Python instance

[Raik Gruenberg]

Hi all,

I have got some home-made class. From within the same Python interpreter 
  I can create, dump and load it back without any problem. But, if I try 
to load it after re-starting the interpreter, I end up with a 
segmentation fault.

Example (Traj is the trouble maker, Load and Dump are just wrappers for 
cPickle.load and dump):

from Traj import Traj
from tools import Load, Dump

t = Traj(['../test/lig.pdb'], '../test/lig.pdb')

Dump( t, 't.t' )

-----
... NOW RESTART PYTHON ...
-----

 >>> from tools import *
 >>> Load( 't.t' )

Process Python segmentation fault

It's all the same regardless whether I use Python 2.2 or 2.1. Switching 
to pickle.load and dump doesn't change anything either. However, only 
this particular class is affected.

Given the segmentation fault, at least, some sort of Python bug must be 
involved, right? Obviously, it is also somewhat the fault of this 
particular class. I narrowed down the problem somewhat. But, before 
bothering you with all the details, perhaps anyone knows this problem or 
has some promising idea???

Thanks for any hints/suggestions!
Raik