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I was having issues with Modo obj export earlier. Asset Forge doesn't seem to like certain flags, like 'group'. Modo seems to want to always add a default group, so I opened the obj in a text editor and removed all group references and it worked fine.

.obj file format

In my case it\s simply the way C4D exports, opening the same .obj files in blender yields the same results as presented by Kenney above. Where it just scales really weirdly.