One version of the dxf file has this in the header (this dxf file renders an image correctly)
The other has this (this dxf doesnt render correctly) Generates a 1kb file with a few pixels
Both look fine in viewer.autodesk.com/designviews
I know pretty much nothing about AutoDesk and due to graphic card issues I can't install and run it on my development box.
We are trying to look for an alternative to RealDWG since they don't have an eval version and I can't get AutoDesk installed to try the ObjectARX SDK to verify RealDWG would work.
I believe all our engineers are limited to version 2016.
If it will help, I can send / upload the file that isn't working.