I got the same problem with the following loop :

#declare size_x = 20;
#declare size_y = 20;

#declare py = 0;
#while (py < size_y)

 #declare px = 0;
  #while (px < size_x)
  
    #declare Value = px*py;
    #declare px = px + 1;
    
  #end
  
  #declare py = py + 1;
  
#end

But noticed that it doesn't crash if nothing is done within the loop
(comment out the Value declaration).

POV-Ray 3.5 beta5, WinME, Celeron633, 128Mb.

Fabien.

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