>4) The contrast in the upper right of the middle sphere is exceptionally low
>in the two later images--any idea why?

Try changing the sphere's diffuse value to 1, or make the pigment brighter
than 1.  It seems that sometimes radiosity will not brighten a surface past
diffuse*pigment, no matter how bright the surroundings.  Increasing
max_sample doesn't seem to help either.  Is this a bug?

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