Hi there,
I’ve got few questions regarding awesome ZB4, they could be answered earlier, but I didn’t find answers.
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ZSub + Rgb and Layers - I’ve came across quite unpleasant thing. I know that, when I have layer, then alt+drag is should erase polypaint, but what should I do when I want to “cut” into model with polypaint, it’s possible without layers, but with them it’s impossible.
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remove polypaint from layer - it isn’t working for me, I have sculpt and polypaint in layer and when I have only rgb mode active and I paint with alt pressed over model, it’s not erasing anything, it’s only doing white “halo” around brush.
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split layer - it separates polypaint, but sculpting stuff in second layer is gone.
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polypaint and hide mesh - I’ve got mesh with 6 subdivs and polypaint, when I hide part of mesh polypaint is messed up. It looks like mosaic, when I make mesh visible polypaint returns to it’s correct look.
So that all for know. On the other hand ZB4 is great release, great new features, speed, stability, thanks for it. 
I’ll hope that’s unique problem.
because it’s really great feature
So good luck with solving this.