Hello,
I have encountered a bug that causes random (but in a reproducable way) 
render blocks to "see through" through a reflective isosurface, when 
there is also a second isosurface in the scene. (A lot of preconditions) 
This is definitely not connected to a wrong max_gradient. When I 
commented out the code responsible for the isosurface caching, the 
isosurface rendered correctly. It seems as if povray thinks there was a 
cache hit, when there was actually none.
Test scene:

#include "colors.inc"
#include "functions.inc"

camera
{
  location <-.02,  .54,- .65>
  look_at  <-.07, 0   ,- .16>
}

#declare f_decocube=function(x,y,z,a,b){

   (pow(x*x+y*y-a*a,2)+pow(z*z-1,2))

  *(pow(y*y+z*z-a*a,2)+pow(x*x-1,2))

  *(pow(z*z+x*x-a*a,2)+pow(y*y-1,2))

  -b

}
isosurface
{

  function { f_decocube(x,y,z,0.95,0.011) }

  evaluate 194 * .25, 1.3, .8

  contained_by{sphere {0,1.5}}
  accuracy 0.001
  pigment { Blue }
  translate y*1.06
  scale .05
  translate <-.8, 0, .28>

}
isosurface
{
  function { f_sphere(x, y, z, 1) }
  contained_by { sphere { 0, 1.0001 } }
  max_gradient 1.322
  accuracy 0.004
  pigment { Red }
  finish { reflection 0.5 }
  scale .04
  rotate <-5, 0, 15>
  translate <-.4, .04, -.2>
}
light_source
{
  <-200, 103, 95> * 10000
  color <1, .95, .75> * 2.4
}

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