Sometimes when content is exported via 3DXChange using the Export OBJ option, the resulting file is corrupt and cannot be re-imported by 3DXChange. In software which does manage to read the corrupt file, the resulting content is not correct.

I have not been able to identify what causes this problem and so far I have found only one item that generates it.

The problem can be seen in the following video:

https://youtu.be/QmcErogPIJ8