Incompatibility between Linux and XP

I'm a new python user, basically trying to learn python using matplotlib
for a little project.

My code works fine on Linux, but it fails on Windows XP. I'm running
the latest version of Matplotlib and SciPy python, 2.3.3.

Before I go to a lot of effort to build a small demo program to show the
failure, I thought I would ask to see of there are known incompatibilities
between Linux and XP that might be causing my problem.

The line of code that seems to precipitate the failure is :

self.Cax_c = figtext(0.84, .1, '000')

that gives an error on Windows XP of :

.....matplotlib\", line 665 in set_text
TypeError: This doesn't look like a string: '0.0'




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