Kerbal Space Program

As you can see on the screenshots, panels have very strange shading depending on the angle of the lighting. It was already present in 1.4.2, but it was a little bit better. I discovered that in 1.4.2 main texture for the white grey panels didn't have alpha channel, now it has alpha channel and it is way worse. It's not alpha channel doing it, but shader setting on the part itself, I think, it must be wrong somewhere.