The libpng warnings are because more recent versions have stricter checks
on the format of the image files. This was fixed for Spyder 2.3.5 (here's
the PR in case you are interested in the corresponding discussion:
https://github.com/spyder-ide/spyder/pull/2216). You do not need to
downgrade libpng, the only reason to either downgrade libpng or upgrade to
spyder 2.3.5 is (as far as I am aware of at least) that these messages
could annoy you :-)

Regards,
David

On 13 July 2015 at 20:05, egayer <[email protected]> wrote:

> I can't recall if libpng has been updated while updating iPython Notebook
> to Jupyter, but I am guessing it is the case, do I need to downgrade to an
> older version of libpng ?
>
> Thanks
> Eric
>
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