The DXF files I am exporting from CorelDRAW on the Design Lab computer seem to be clean when they import to RD Works.
I do make sure prior to export that I remove fills and make all lines hairline. Filled objects must be ‘closed’ ie, the nodes are connected all around the perimeter of the object. If they are not, the comp adds a wild line to auto connect the open object.
One thing I am still trying the get right is making multiples easily, ie telling RDWorks to make 16 duplicates of something 4x4 with a certain distance between them. I can make the field, but it wont cut them.