Quote - [Addendum: I just noticed a new artifact - different kind - between the two big boxes on the ground. Do you see it? It is also between the middle box and the big sphere. It's not in the first render. So we're screwed - one kind of artifact with IC on, another kind with IC off.]

o.k. I'll try this scene, bill.  I dunno why that artifact appears.  it only appears with a gradient img on envsphere?