I’ve named this Sven’s Bug because I noticed it running his code posted 
in “15 Shapes Taking Forever” in povray.general
And so he gets his name on something. :-P

There is a difference between renders with and without using Render 
Block Size.
The images are with the windows QUICKRES.INI [800x600, AA 0.3] with and 
without +BS8
I compared them in PaintShop Pro (XOR shows it best)

Ver 3.7.0.msvc10.win64
On Win7

-- 

Regards
     Stephen

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