Material changes from Wings to Maya

[Arg Arg]

i don´t know if i understand you right ...if not so, iam sorry
it could be a problem by the importer... maybe some datas are just ignored.
maybe it´s another problem.

to check for yourself what happens, you can create a simple cube in maya.
than apply any material of your choice to the cube.
export it out of maya.
open the exported material file (*.mtl) with a texteditor (i would recommend to download Notepad++).
import the cube to wings.
export it out of wings.
open the exported material file also with the texteditor and compare it side by side (maya-export-mtl and wings-export-mtl).
you can also post the content of both files here.