No matter which is my choice, the window crashes and I get
> the usual XP message about sending error messages to
> Microsoft and so on. It is a strange exception, if I
> resize the window VERY slowly, there is no exception
> (usually).
There is a known bug in Agg on Windows XP that appears on repeated
draws (resizing does this) that causes a segmentation fault. I've
only seen this in the context of draw markers (eg
plot(x,y,'o')
where 'o' is a plot marker symbol. Do you have markers in your plot?
Unfortunately, even though I think I know where the bug is occurring,
I don't yet have a fix for it. If it is too annoying, you may want to
roll back to 0.71 until I figure this one out.
> Problem 2: Considering always the keypress_demo.py, if I
> run it (without resizing the window 
) and I press the
> key "g" (for the grid), the grid appears and suddenly
> disappears. I opened the keypress_demo.py and I commented
> out the draw() command (that follows the grid() command),
> and now the grid does not disappear. What could be the
> problem with draw()?!? I have to use it in my application,
> but I am not able to display the grid...
Oh, I get it 
the 'g' key is now a default part of matplotlib -- eg pressing 'g'
toggles the grid on any axes. I wrote the keypress_demo before making
this behavior default, so what you see in the demo is that you toggle
grid two times in keypress_demo, once in the default axes handling,
and once in the demo. And so it ends up turning it on and back off.
Time to update the demo!
> Thank your for every suggestion, and sorry for the long
> post.
Bug reports are always welcome -- thanks!
JDH