Beta 2 carries over the beta 1 bug where blob components over a certain 
radius aren't rendered.

Demonstration:

/*
Two spheres at different locations, one r=316 units, one r=317 units.  Only
the smaller sphere is rendered by Pov.
*/
blob
{
    threshold 0.75
    sphere {<-300,0,0>, 316, 1} // This blob is visible
    sphere {<300,0,0>, 317, 1}  // this blob is invisible
    pigment {rgb 1}
//    sturm  //makes no difference
}

camera {location <0,0,1000> look_at 0}
light_source {<0,0,1000> color rgb 1}

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