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+Textures imported via Build->Upload->Material that have an all opaque (255) alpha channel should have their alpha channel removed before upload.
+
+1. Make 4 images that have different colors but all 255 alpha channels
+2. Upload them all using Build->Upload->Material, with one in each of the material texture slots
+3. Verify that using the textures as a blinn-phong diffuse map does not make the corresponding face render in the alpha pass (face should stay visible after disabling alpha pass by unchecking Advanced->Render Types->Alpha).