I did some hunting this morning

These scatter nodes seem to be the problem. They turn any pure black to white. Changing any of the settings in the nodes does nothing to help. Change the black even the slightest and it works again. You can edit the actual image or you can use a mix node to make it work.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10