I can’t say I’ve ever run into problems using pngs. Maybe the problem was with older versions. I didn’t start until p6. I always assumed the prolific use of jpgs was because they were much smaller files and storage was pricier. 

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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