Sorry if this is in the wrong group, but I thought would be better be sure
of the error before making a report.
The "Insert Menu - Special Effects - Global Photons" is supposed to haven't
one of the }'s? Because mine is just like the following, and doesn't render
without adding a } at the end:

// adding a photon{} block to global_settings activates photon mapping.
// photons also need to be adjusted for light sources and objects.
global_settings {
  photons {
    spacing 0.01                 // specify the density of photons
    file://count 100000               // alternatively use a total number of
photons

    file://gather min, max            // amount of photons gathered during
render [20, 100]
    file://media max_steps [,factor]  // media photons
    file://jitter 1.0                 // jitter phor photon rays
    file://max_trace_level 5          // optional separate max_trace_level
    file://adc_bailout 1/255          // see global adc_bailout
    file://save_file "filename"       // save photons to file
    file://load_file "filename"       // load photons from file
    file://autostop 0                 // photon autostop option
    file://radius 10                  // manually specified search radius
    // (---Adaptive Search Radius---)
    file://steps 1
    file://expand_thresholds 0.2, 40
}


// Renato Oliveira

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