For what it’s worth, I encounter the same thing using JetBrains RubyMine IDE 
for Ruby.  I have also suspected this is a rabbit-hole, if not an outright 
trap, so have simply lived with it.  It doesn’t seem to matter whether I accept 
the suggestion to reload the files or not, so whatever it is seems benign, 
albeit annoying.
Out of curiosity — are you running on Mac OS X, which is where I’m using 
RubyMine, or is this issue cross-platform?

cheers,
Bill

On Dec 4, 2014, at 2:43 AM, Stephen De Gabrielle <[email protected]> 
wrote:

> I've had the same thing using scribble, but including screenshot images 
> I just assumed it was pdflatex that was calling libpng, and the problem was 
> either pdflatex how it was passing the image to libpng, or libpng itself, 
> rather than anything in racket. (It seemed like a rabbit-hole that I was 
> unlikely to navigate successfully)
> 
> S.
> On Thu, 4 Dec 2014 at 04:31, Prabhakar Ragde <[email protected]> wrote:
> I'm currently using Racket 6.1. For some time now, when editing Scribble
> files in DrRacket, I've been getting "file has changed on disk" messages
> when trying to save or render - not consistently, just every so often.
> These are files I am not editing in anything other than DrRacket. I
> click "ignore" and everything works fine, but it is annoying.
> 
> Just now, when rendering a Scribble document, I see in the Interactions
> window the error "libpng warning: iCCP: Not recognizing known sRGB
> profile that has been edited". The rendering proceeds just fine. This is
> rendering to PDF using some included images that have been created using
> OmniGraffle. The same images used in render to HTML do not give such
> warnings. --PR
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