error with embedding_in_wx.py

I am using the latest CVS release of matplotlib
from sourceforge, and when I try to run the
wx backend example I get

gyrotwystron examples # python embedding_in_wx.py
Could not import mathtext (build with ft2font)

GThread-ERROR **: GThread system may only be initialized once.
aborting...
Aborted

The gtk backend examples work fine (although I still get
the mathtext warning). I have python 2.3 and wxPython 2.4.2.4
on a gentoo linux system.

Thanks!

jgw