If I set pretrace_end to less than 1 pixel POV-Ray fails to render(stalls)

160x120 resolution
1/160=.00625

box {-1,1 translate <0,0,10>}
background { color rgb <0.1, 0.3, 0.8> }
global_settings {
  radiosity {
    pretrace_end   0.00625          //works 160x120
    //pretrace_end   0.006249        //fails 160x120
    //pretrace_end   0.003125        //work 320x200
    //pretrace_end   0.0031249      //fails 320x200
  }
}

Win98se AMD Athlon 2200+ 256mb
3.7.0.beta.12a.icl8.win32

Stephen

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