Version 1.65 Problem with Tool Paint - texture image is rendered in poor resolution (staircase) on object. Already once created objects past are ok with same textures.
Try increasing the poly count of the mesh, if you paint on a mesh surface that doesn’t have UVs you are painting vertex colours (polypaint) and the resolution of paint marks or image quality is dependant on the mesh density.
Faces 393. Vertices 393k Quad 393k
Thank you, but I think I have misread something here at some point.