Appears to be radiosity.  Continue works as intended.
Without the radioisty the image can be continued without alteration, with
radiosity it changes each time.

"Patrick Dugan" <pat### [at] usnetcomcorpcom> wrote in message
news:3b9f8d48@news.povray.org...
> I have included two images and the source code.  The first image is the
> actual output, the second I used green circles to highlight the areas I am
> referring to.  This image was created by simply allowing the render to get
> about 10 percent complete then stopping and then (using the +c switch)
> continuing the render.  I stopped and continued the render several times.
> As you can see the coloration of the image changed each time I did a
> continue even though no code was changed.  The background, metal box and
the
> wood box were all changed.  This also happens within Megapov 0.7.  ( I
> haven't tested with any other versions.)
>
>
>

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