Hello,
some time ago I warned about possible bug in photons/dispersion code. Now, 
I confirmed bug (on another computer), so maybe it's worth further 
inwestigation ?

Sometimes in scenes using photns + dispersion, dispersion settings are 
ignored (and after re-rendering scene with SAME .pov file - sometimes it is 
rendered o.k., and sometimes - without dispersion).

Details are here :
  http://raf256.com/pov/bug?id=1

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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