I've been repainting textures for years with no problem. You need to hit reload texture before it will change. And even then it might not update in the node preview unless you close that preview and reopen it. Or maybe that's my impatience. I don't have the fastest computer. And yeah, it shows in the scene preview if the shader is showing up there.

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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