It's still glitching, even after unchecking interpolation and making shadow accuracy match object accuracy. Only other things I could think to try are to change the ray depth and move up the photon count and map accuracy.

Edit: Would they be interested in 5.1 Pro bugs? I thought limited support was part of the CG World magazine deal, unless you opted to upgrade to the current version.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.