Unfortunately I cannot reproduce either error. But I understand the material issue would be frustrating. Can you pls send me both scenes which produce the errors above, and I will look into it further. Email to paul at physicalc-software dot com, or PM me a download link. I am keen to get these sorted out.
Paul
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Octane Plugin Support : Poser, ArchiCAD, Revit, Inventor, AutoCAD, Rhino, Modo, Nuke
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Octane Plugin Support : Poser, ArchiCAD, Revit, Inventor, AutoCAD, Rhino, Modo, Nuke
Pls read before submitting a support question