Here are the normals that L3P uses:
#declare L3NormalBumps = normal { bumps 0.01 scale 20 }
#declare L3NormalSlope = normal { bumps 0.3 scale 0.5 }
They differ from yours as well as LDView's. Ideally, these should have been defined by Lutz Uhlmann, not by Lars or you or Travis.
Also, I just tried using your lg_color_slope.inc and the render quits when it gets to lg_metallic_dark_grey. Do you have an updated lg_color.inc with that color in it? Because it does not exist in my copy.
#declare L3NormalBumps = normal { bumps 0.01 scale 20 }
#declare L3NormalSlope = normal { bumps 0.3 scale 0.5 }
They differ from yours as well as LDView's. Ideally, these should have been defined by Lutz Uhlmann, not by Lars or you or Travis.
Also, I just tried using your lg_color_slope.inc and the render quits when it gets to lg_metallic_dark_grey. Do you have an updated lg_color.inc with that color in it? Because it does not exist in my copy.