Python error when trying to change font

1. I start pyroom with ./pyroom
2. I hit CTL+P to bring up preferences
3. I click the font button
4. I select a different font face
5. I click "OK"
6. I see an error message saying:

Traceback (most recent call last):

  File "/home/chrisd/src/pyroom/PyRoom/preferences.py", line 178, in change_font
    font_type = widget.get_name().split('_')[1]

IndexError: list index out of range

7. In stdout in the terminal, I get the following errors:

/home/chrisd/src/pyroom/PyRoom/cmdline.py:74: PangoWarning: failed to choose a font, expect ugly output. engine-type='PangoRenderFc', script='common'
  gtk.main()

8. The "Custom font" radio button is checked now but the font button disabled
9. Clicking any other font option ("Default document", "Default monospace") results in the same error

It appears that checking any of the font options causes the same problem to occur.

Version information:
./pyroom --version
pyroom 0.4.2

I pulled this from the bzr repo at 10:55 AM on Mon, Aug 23rd, 2010.