This is nothing new. It was in poser 7. If I had to guess, it has something with being able to set a background color in the pose room. I like to have my background set to green for higher contrast. Even when I set up a background image, the background stays green in the pose room.

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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