Eric Firing wrote: > Darren, > > I just tried it with (numpy imported as n) > In [23]:n.__version__ > Out[23]:'0.9.4.1914' > > and I don't get the error. Are you using a newer version of numpy? This is a problem with masked arrays in the newer version of numpy. Someone is doing a lot of work on masked arrays and probably not aware of their use in matplotlib. Recently, for example, the return type for no mask was changed from None to False (I'm not sure why...I'm asking him right now). That is causing the problem because there is a check for None in the matplotlib code (but not for False...). We'll get this cleared up, thanks for the report... -Travis