Thanks for your help David, 
Since matplotlib crashed in spyder right after these error messages 
appeared for the first time, I first thought the libpng pb would be bad, 
but if it is just annoying me then I think I'll manage :)
thanks again !

On Monday, July 13, 2015 at 11:01:56 PM UTC+2, David wrote:
>
> 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] <javascript:>> 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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