AutoCad 3D :: Erratic Lines In FLATSHOT Command 2013

I produce a lot of "Exploded View" style drawings for our equipment for assembly drawings and Operators Manuals. I model everything in 3D, set the perspective view, adjust the view I like, then use the Flatshot command to make 2D lines and arcs verions of the view to put into paperspace. Then item bubbles, notes, whatever. as of the last week, my flatshots, if they include a hex bolt head in the view, the arcs on the faces of the flats will be really stretched and skewed decidley toward the vanishing point in the completion of the Flatshot command. It does not happen on other arcs that may be in the model, seems to be exclusive with the hex. I doesn't happen if I do not make the view pespective but leave it "Parallell".