Hi Oliver, are you also possibly using an old version of Blender or something?
Over here doing a quick test with the default OBJ importer in Blender 2.49 seems to preserve materials fine for me.
Just make sure in MoI under Options > Import/Export > OBJ options, you have both "Write material assignments" and "Write .mtl file" enabled.
This in MoI:
Just using the default Blender OBJ import options which is like this:
Gives me this result in Blender:
- Michael
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