Not sure what might be causing the spots on the image below, any ideas would be
appreciated. This is actually the best of a bad bunch of renders some of which
had lots more black spots. Render took 14 hours so trying to fix the issue is
time consuming. Might try a 3.6 render to see if it is 3.7 related..

Rendered with 3.7.

image uses focal blur and radiosity.

Focal blur settings:

#declare useFocalBlur           = 4; //(0-99)

camera {
  location  <0, -32, -55>
  direction 1.5*z
  right     x*image_width/image_height
  look_at   <0, -25,  40.0>
  #if(useFocalBlur)
        aperture 0.005
        blur_samples useFocalBlur*2
        focal_point <-22, -23, 20>
        confidence 0.9+(0.001*useFocalBlur)
        variance 1/(800*useFocalBlur)
  #end
}

Images uses following radiosity settings, I am loading pre-calculated radiosity
using +RF"filename" and +RFI:


#declare useRad                 = 1;
#declare radQuality             = 10;
#declare PRETRACE_END=2/image_width;

global_settings {

 assumed_gamma 1
 max_trace_level 25
#if(useRad)
 ambient_light 0
 radiosity {
  #if (useRad=2)
    pretrace_start 1
  pretrace_end PRETRACE_END

  error_bound 0.5
                brightness 0.7
  count 5*radQuality
                nearest_count 15
                low_error_factor .8
                gray_threshold 0
                recursion_limit 2
                adc_bailout 0.01/2
                media on
                normal on
  #end
  #if(useRad=1)
    // load settings
    pretrace_start 1 pretrace_end 1
    error_bound 0.5
    brightness 0.7
    recursion_limit 2
    media on
    normal on
    always_sample off
  #end
 }
#end
}

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