Hello. Why do I get such awful seams in Painter with Normals Map from Toolbag? In Toolbag seams are almost absolutely invisible! Y channel is flipped for Painter.
Ok, I see now what's happening: textures were saved as PNGs with transparency, somehow Toolbag wasnt including padding as visible part of the alpha channel...
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Other than that I'm not sure what could cause this, you may get more help if you post in the Substance forum.