As far as I remember, PP2012 can do real idl? Ibl ao is sort of a cheat and has som issues. Have you tried with real idl and wheter that makes the stripe go away? I have a little voice in my head insisting on something like shadow bias, being the cause of thisbut I'm not sure it's right.

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.