Correction, this error occurs on all GUI backends I've tried (I don't  
have gtk installed). The malloc error didn't occur on the other  
backends until I tried to interact with the plot window.

-T


On May 27, 2009, at 12:36 PM, Tony S Yu wrote:

> I'm running into a really bizarre error that seems to have started
> spontaneously (no changes I can think of were made to my system in the
> last few days and mpl was plotting without problems up until a few
> hours ago). When using WxAgg, the following code raises a malloc  
> error.
>
>>>> import matplotlib.pyplot as plt
>>>> plt.plot([0, 1])
>>>> plt.show()
>
> Python(477,0xa0710720) malloc: *** error for object 0x220068: Non-
> aligned pointer being freed
> *** set a breakpoint in malloc_error_break to debug
>
> This error only occurs on the Wx/WxAgg backends AND when show() is
> called; Qt4Agg, TkAgg, and MacOSX backends work fine.
>
> This error is also generated when starting ipython with the pylab flag
> (and WxAgg set as the default backend).
>
> Sorry I can't give more information about the error itself; I'm not
> sure how to in this case.
>
> Thanks in advance for your help,
> -Tony
>
> Mac OS X 10.5.7
> Python 2.5.1
> Matplotlib trunk r7142
> WX 2.8.4.0 (mac-unicode)
>
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