POV 3.5 b 7 both compiles on PII 233 128 MB with NT 4 Sp 6

I couldn't find any similiar bug on 'Known bugs' list so I report it.

I made automation to create bitmaps for my 'Enhanced Include Menu' sended to
povray.beta-test.binaries. During creation for pigments of 'woods.inc' I found
some images broken. I've searched similiar parameters within broken pigments.
Good pigments use wood pattern, broken pigments use bozo pattern. The bug is not
random. Pigments are the same after every render and in both compile versions.
Package with good and bad images, scripts and ini-settings after moment in
povray.beta-test.binaries. Broken patterns are 4B, 7B, 12A, 15A and 16A.

ABX
--
#declare _=function(a,b,x){((a^2)+(b^2))^.5-x}#default {pigment{color rgb 1}}
union{plane{y,-3}plane{-x,-3}finish{reflection 1 ambient 0}}isosurface{ //ABX
function{_(x-2,y,1)|_((x+y)*.7,z,.1)|_((x+y+2)*.7,z,.1)|_(x/2+y*.8+1.5,z,.1)}
contained_by{box{<0,-3,-.1>,<3,0,.1>}}translate z*15finish{ambient 1}}//POV35

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