Aargh what is this magic?
So I retested it because I get like that sometimes, maybe I can crack this impossible problem, but of course I can't.
Interesting though, that adding edit normal modifier in max fixes some of the errors! How so? Who knows! It must be magic!
from left to right, scanline, shader before edit normals, shader after edit normals.
good old max, the package that keeps on giving!
oh, I think this is the same as undoz posted, sorry!