I had a problem with a mirror behind a sheet of glass. Without
radiosity, there were no spots. Turning radiosity on, lots of little
dots between the mirror and glass sheet. The problem in that was diffuse
>0.0 on the mirror surface. That, combined with the glass surfaces,
caused circular little dots. Radiosity settings changed only the size
and locations of the dots in my scene.

I don't know that it's the same problem in your scene, but it's
something else you can look at.

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