Hello Everyone,
Found the problem!
It looks like the issue is that if the name of the surface has a non-english character in it. Apparently when we generate the MTL file and the OBJ file, they can use different conversions for these types of characters, and so there won't be a match when the OBJ file tries to load the texture through the MTL file. The reason I couldn't reproduce this at first is that I was testing in the INT version, and everything is written with english characters in that version.
I have added the issue to our list and we will fix it as soon as we can. Once it is fixed, you will find it in the update release note as fix #257744.
In the meantime, please avoid using non-english characters in surface names if you plan to export to OBJ format, or if that is not possible, then export through another format (e.g. FBX, TM, SKP, etc.).
Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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