I've been seeing some strange things when I try to create a drawing of a particular part.  When I insert the part into a border, the part insert and creates views fine.  When I save it and reopen it, the part has disappeared.  The views are replaced by the box you get when a drawing can't find a part, although the alert warning about that doesn't pop up when I'm opening the part.  If I right click on the box, the part that should show there opens up, but in the area in the top center of the part window where the part name is displayed, it displays it without the customary file extension (i.e., .sldprt).  See the screen shot.  Finally, when I save the assembly or the drawing the part is located in, Solidworks keeps asking me if I want to save.  Has anyone seen this before?