Dear PyMol Experts,
I am quite new in pymol. I have just installed  python 2.3.2
and pymol-0.93 using "python" (i.e. pymol was
installed in site-packages of python). I am using RedHat 8.0
on a dual Xeon system.

Here's the problems that I am getting:

(1) Case  1:

>>> import pymol
>>> pymol.finish_launching()
>>> Segmentation fault (core dumped)

(2) Case 2:

>>> from pymol import cmd
after couple of seconds, it crashes again with the following error:
>>> Fatal Python error: GC object already tracked

Interestingly after ">>> from pymol import cmd", I can use the
external gui, run demos, etc. However as soon as I move my
mouse over the python shell,  the program aborts and gives
the "Fatal Python error: GC object already tracked"???

I have a feeling that this error is related to the external GUI application. 
Is it possible to disable the external gui when I lounch pymol from 

I really appreciate any help you can provide me. At first I was very excited
about using pymol in my research but now I am getting a little bit
frustrated. I need to find a way to launch pymol from python without
segmentation fault...

thanks alot,


Dr. Taner Yildirim, Ph.D. Physicist, Condensed Matter Science Group,                     NIST Center for Neutron Research, 
PHONE: 301-975-6228     National Institute of Standards & Technology
FAX  : 301-921-9847                      Gaithersburg, MD 20899-8562
Web  :

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