Cryopatra
In the DXF you are trying to import.. Any region (Closed Space) should be drafted as a polyline and in most of the cases it is not. Even if its a polyline it should be closed.
Ahandsomemind
SLOPE/W
I worked on the new slope/W. The DXF issue is a bug and they are working to solve it. I have a work around for that problem. clearly explaing ur porblem. I will be happy to help you
ahandsomemind