I have several drawings created in AutoCAD where entities in viewports are invisible in DraftSight.  I know they are there because the entities appear when the drawing is opened in AutoCAD or eDrawings.  In DraftSight, when I pass the crosshairs over the entities they highlight and can be selected, but are still invisible.  The entities are visible in Model Space.

 This seems to happen on drawings created in AutoCAD.  Anyone know of any fixes for this?