Plot show() errors, Mac OS 10.6

operating system
$ uname -a
Darwin nate-gallaghers-macbook-pro.local 10.6.0 Darwin Kernel Version 10.6.0:
Wed Nov 10 18:13:17 PST 2010; root:xnu-1504.9.26~3/RELEASE_I386 i386

matplotlib version:
matplotlib-1.0.1-python.org-32bit-py2.7-macosx10.3.dmg

obtained from:
http://sourceforge.net/projects/matplotlib/files/matplotlib/matplotlib-1.0.1/

no customizations to matplotlibrc

$ python simple_plot.py --verbose-helpful

$HOME=/Users/ibook
CONFIGDIR=/Users/ibook/.matplotlib
matplotlib data path
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/mpl-data

loaded rc file
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/mpl-data/matplotlibrc

matplotlib version 1.0.1
verbose.level helpful
interactive is False
units is False
platform is darwin
Using fontManager instance from /Users/ibook/.matplotlib/fontList.cache
backend TkAgg version 8.5
findfont: Matching
:family=sans-serif:style=normal:variant=normal:weight=normal:stretch=normal:size=medium
to Bitstream Vera Sans
(/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/mpl-data/fonts/ttf/Vera.ttf)
with score of 0.000000
Exception in Tkinter callback
Traceback (most recent call last):
  File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py",
line 1410, in __call__
    return self.func(*args)
  File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py",
line 245, in resize
    self.show()
  File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py",
line 249, in draw
    tkagg.blit(self._tkphoto, self.renderer._renderer, colormode=2)
  File
"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/tkagg.py",
line 19, in blit
    tk.call("PyAggImagePhoto", photoimage, id(aggimage), colormode,
id(bbox_array))
TclError