This is Corel (above)...and below I have the exported .dxf opened in AutoCad.
As you can see, something is wrong with my export. All good in Corel but messed up in .dxf when opened in AutoCad. What can be wrong with my file?
Importing back that .dxf into Corel seems to work just fine though...
If you haven't done this already, you might try using different "versions" in the DXF export dialog to find out if a particular version works best for what you are trying to do.