I don't use background images often but I do remember sometimes having issues if I tried to set up a background in the material room like you would for adding a texture to a prop. If You used file>import>background picture, it worked. I don't know how or why. I never looked into it further.

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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