Can you provide a standalone example that exhibits this problem?  I'm 
not able to reproduce this with 0.90.1 and the imshow examples 
(image_demo.py, image_origin.py).

Which backend are you using?

My only wild guess is -- with the Agg backend (possibly others), the 
image is stored flipped from how Agg wants to render it.  So, the image 
is flipped (not the data, just the stride), then it is drawn, then it is 
flipped back.  If there were an exception in the middle there, the 
number of flips may not remain even.  Are there any exceptions being 
output?  (These exceptions, since they're inside a GUI callback wouldn't 
necessarily halt the application).  Beyond that, you could trace calls 
to im.flipupd_out and make sure they are even in number.

Cheers,
Mike

John Pye wrote:
> Hi all
> 
> I have  a problem with 'imshow' under matplotlib 0.90.1-2ubuntu1 on
> ubuntu 7.10. I have an 'incidence matrix' created using the 'imshow'
> command, and it works well except for the fact that sometimes when
> resizing my window, the incidence matrix flips upside-down.
> 
> Can I control this flipping of the incidence matrix? it seems to me to
> be something that has just happened in a recent release of matplotlib,
> as my application didn't used to show this problem.
> 
> FYI The code that I'm using to drive mpl is here:
> http://ascendcode.cheme.cmu.edu/viewvc.cgi/code/branches/extfn/pygtk/incidencematrix.py?view=markup
> 
> Cheers
> JP
> 
> 
> 
> 
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

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