[PyMOL] strange pymol crash

Hello:
I have a strange crash problem with pymol.  I've had
the 64 bit version 1.0r2 installed on two Fedora 8
machines for several weeks and up until yesterday or
so everything was working just fine.  Now pymol will
not start on either machine.  Here is the error:

python: Modules/gcmodule.c:276: visit_decref:
Assertion `gc->gc.gc_refs != 0' failed.
/usr/local/bin/pymol: line 2:  3127 Aborted           
     /usr/bin/python
/usr/lib64/python2.5/site-packages/pymol/__init__.py
$*

I tried rebuilding the NVIDIA driver for one machine,
but that did not fix the problem.  I also uninstalled
and reinstalled pymol, but it didn't help either. 
Perhaps I did something to both machines to cause
pymol to crash, but I don't know what that was.  As
far as I know, no Fedora updates were made before the
crashes.  I did try installing updates for one
machine, but that did not help.  I get the same error
if I try to use "import pymol" in an interactive
python shell.  Any ideas on how to fix it?

John





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