Hi Grim!

> The problem seems to be exacerbated by the use of 'filter' versus
> 'transmit.' I didn't play with your scene enough to render a complete
image
> (it is your effort after all), but I can tell you that I believe this is
the
> way to go. Instead of using rgbf you might try rgbt. The fog doesn't help
> either, so you may wish to add a transmit value to it, too.
But it even appears without filter nor transmit. Somehow the normal in that
region is not right, causing the rays to refract the wrong way. But you can
see the error even just with a strange shading

> Good luck!
Thanks

cukk

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