Poser ignoring the blue channel and using a value it calculates for itself rings a bell. It's probably unrelated, but just in case - It was something to do with trying to calculate your own normal map for a hemisphere, doing it all in the material room. Simple square root of sum of squares formulae to get the R,G,B components of a unit vector for the normal, but Poser was ignoring the (correctly) calculated blue value and using it's own (incorrect) value for blue. bagginsbill was involved in the discussion, which was either here or at RDNA.

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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).