undefined symbol?

[Nemtos]

Hi,

I upgraded my laptop from RH9 to Fedora 3 yesterday. It seems to have a 
problem with an undefined symbol in Python. Specifically, if I try to run 
system-config-packages, I get the following error:

Unable to import gtk module.  This may be due to running without
$DISPLAY set.  Exception was:
/usr/lib/python2.3/site-packages/gtk-2.0/gtk/_gtk.so: undefined symbol:
gtk_font_button_set_show_style

I get similar errors running other system-config-* applications.

I have python 2.3.4-13.1, pygtk2-2.4.0-1 and gtk2-2.4.14-3.fc3. Still the 
error message above refers to a library in the Python sub-directory named 
gtk-2.0: could that be the problem? What am I missing here?
(Note that DISPLAY is correctly set to :0.0)

hint/help/solution would be greatly appreciated.
Thanks
Nemtos