Hi timo, I'm not really familiar with Mudbox myself but the automatic UVs that MoI generates itself are just not really suitable at all for painting, you'll probably need to have better UVs generated to get good painting results.
I don't know if it helps you or not but you can turn off MoI's automatic UV generation in the moi.ini file, go to Options > General and push the Edit .ini file button, then inside there go down to the [OBJ Export] section, and find the entry for WriteTextureCoordinates=y and edit it to say =n like this:
[OBJ Export]
<....>
WriteTextureCoordinates=n
If Mudbox does not generate good UVs for itself to use, maybe one of these standalone uvmapping programs will do a better job:
UVMapper: http://www.uvmapper.com/
Unwrap3D: http://www.unwrap3d.com/u3d/index.aspx
Unfold3D: http://www.polygonal-design.fr/
- Michael
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