I sort of rebuild the scene using simple untextured blocks, the EnvSphere with no image but 50% gray and a white 100% infinite light, raytrace shadow, standard quality. Your 5 bounces 30/30 IDL quality settings.

The point is, there is no setting of anything that reproduces your issue, the deep shadow stroke at the in-side of the block.

So the question is, if you reduce the scene to 3 walls, 1 roof, 1 ground plane, 1 object, 1 dome and 1 light, and no textures, is it still there? If so, tell us your settings or make the scene available. If not, then start adding elements till it re-occurs.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though