Example animation_blit.py Sometimes Works

It seems to be hanging in gtk.main...

$ python /root/matplotlib-0.98.3/examples/animation/animation_blit.py
Traceback (most recent call last):
  File "/root/matplotlib-0.98.3/examples/animation/animation_blit.py",
line 57, in <module>
  File "/usr/lib/python2.5/site-packages/matplotlib/backends/
backend_gtk.py", line 72, in show


On Fri, 17 Oct 2008 14:14:35 +0000, Kenneth Loafman wrote:

The title says it all. I need the simplest blit animation I can find
and when it works animation_blit.py works quite well, but sometimes it
comes up and runs to completion at almost 400 FPS, other times it comes
up and nothing is drawn at all except an empty plot.

Ubuntu Hardy
matplotlib 0.98.3
python 2.5
python-wxGtk 2.8

Any help would be appreciated.