Wasn't it Micha Riser who wrote:
>If you render following scene once with INVERSE = 0 and once with INVERSE = 
>1 you get two different results. Only the rendering with INVERSE = 1 is 
>correct. Inversing the plane should not make any difference though. With 
>'0' get some strange internal reflections in the sphere.

Inversing the plane switches which side of the plane POV considers to be
the inside. 

Normally you don't care which side of a plane is the "inside" unless you
are doing a difference or an intersection, but in this case you've
applied an IOR. The "inside" has IOR 1.3 and the "outside" has IOR 1.0.

To see that this is what's happening by changing the IOR from "1.3" to
"1/1.3" at the same time that you change the value of INVERSE.

-- 
Mike Williams
Gentleman of Leisure

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