Quote - I rarely use AO, since P10 doesn't need it- unless it's in a seperate rendering pass.  I'm fairly certain as well it's the settings... Why are your lights set so high, might I ask?

The 180% for the IBL is based on this http://poser.smithmicro.com/tutorials/poser_IBL.html (I don't use HDR that much, so 180% intensity + 0.5 contrast seems a good start). The infinite was originally at 50%, but this was far too low compared to the IBL intensity, so I wound it up to 75%, 100%, 150% and ended up at 200%. I'll try dialling down

 

kalrua: That could be it - the effect in the first image looks sort-of similar, with distinct horizontal lines. I'll try increasing the irradiance catching.

 

(Alternative option: try using IDL instead of the diffuse IBL...)

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).