> Yes, but nothing changed.
>
> A couple of other things I noticed, the sor rendered correctly with radiosity
> set to a count of 1, but this made the lighting very blotchy.
>
> Also, in the scene I am using a scale where one pov-unit is equal to a metre, so
> this makes the sor really quite small, with it's greatest radius being 0.025
> units. Could this be causing the problem?
>
> D103
>
>

It's indeed a prety small radius and can result in FP acuracy problems. 
It can easily cause some problem, especialy if you have some large 
values elsewhere in your scene, like something at 1 000 000 unit away. 
This result in a 40 000 000 to 1 relative dimentions.

You may try making the sor about 100 times larger in it's definition and 
scale it down 100 times. In some cases that can help.



Alain

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