Quote - when I went to render your test scene is there a reason you have it set to render at half instead of full? that could be part of the problem

The problem originally manifested when I was rendering at full size. I just dropped it down to half to make it easier to post example images here. Full,half or quarter size makes no difference to the end result in Luxrender, so far as I can see.

Did you get the same results though? I'd be interested to know if this issue can be replicated on someone else's system.

I know full well someone's going to point out something obvious I've done wrong in a minute and that I'll feel like a fool, but hey, it might as well be me someone else :-)

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