You did turn off the AO for the lights in your scene before playing with the bias on the AO nodes, right? You had originally been using both lighting AO and Occlusion Master, which doesn't make sense really.

Just to show that this is indeed AO bias causing these spots, and not something else, turn off Raytracing in your render settings, and do a test render without it. If the spots go away when Raytracing is turned off, then you know for sure it's AO bias causing the problem, because AO is raytraced.

Message edited on: 12/16/2005 11:45

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.