Can you post your pc specs please!
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I can't really think of anything that might do this, it works normally for me. As long as you have "Export Textures" on, exported textures go in a folder called textures in the same directory where you exported the model. Unless there is some sort of weird permissions issue where the program is, try running the program as administrator if you are on windows.
If you could record a short clip of what happens that would help figure out this bug.
You would have to make a custom block where a cube is sliced around the border so that it's actually 2 objects, then when you bring it in to asset forge you can freely paint the border and inside part. I'm not sure if you can actually make that custom block itself inside asset forge though you would have to get creative.
Here's a couple of wood furniture I made to test importing.
You can see that when you place the custom object the mapping has errors.
When loading the object, the mtl file I provided works well and does not have those errors.
Suggested solution: Temporarily force custom objects to use the original MTL file and not one generated with Unity.
When you can add a texture map tool then you can remove this limitation.