need help trying to generate dxf file of my sheet metal flat

Hello All,

For some reason I cannot get the attached .sldprt sheet metal part to export to dxf.  I can flatten it and when I right click in the feature manager tree on "flat patttern", the "export to dxf" dialog box comes up and when I go thru the motions, I never see the dxf cleanup box pop up.  I'm sure I've done these steps in past for other flats but this one does nothing and goes to a blank screen (no longer see part in graphics area).  Any help is appreciated.  I have several parts that the shop foreman is satisfied with and now wants them plasma cut but I cannot seem to generate the dxfs.

SolidworksSheet Metal