error in TkAgg

Hi, When I tried to save a plot from the TkAgg GUI, it

    > gave me an error message, here's the whole sesssion

    >>>> show()

One should never call 'show' from the interactive shell; see

But, even considering that, I cannot replicate your bug. What
version of mpl are you using?

    > self.renderer._renderer.write_png(str(filename))
    > UnicodeEncodeError: 'ascii' codec can't encode characters
    > in position 36-37: ord inal not in range(128)

Looks like something funny with unicode -- please describe as much as
possible about your (language) environment and if possible a complete
free-standing script which replicates the bug.