Hello,
@ Jerry Tremble: Thank You for Your answer
I think, the reason for my issue might be, how to set up the *.x file correctly (in terms of containing textures and materials), so that GG can import the Model correctly.
As I mentioned, the import of other bought *.x files with more Textures and materials works fine.
[If You go for publishing Your Game (save as standalone), I need to add the whole textures manually to the created subfolders.
But this is not the issue I am on right now.]
The Problem that I deal with is, that the *.x file, that I created with 2 Textures, did not work properly.
Regards,
R.E.Z.