Comment 1 for bug 554602

a new version of the .dxf routine has been posted in Bug 512447, see comment 8.

could you try this and see if it helps. You will need to download and replace the two files dxf_outlines.py and dxf_outlines.inx in the directory \Inkscape\share\extensions. These two files will be part of the Inkscape 0.48 release.