I'm using Solidworks 2009 SP 5.1 to create new documents, I'm not sure which version this older end tip was created in, BUT when the 3d Model of the assy, or the drawing file of the assy are opened when shading is shut off there are edges of the parts missing.
We have very simple parts, for instance this is simply a round endtip for a medical light guide and edge is not showing when shading is shut off. This has happened on multiple parts too. I open up the main part in solidworks and it looks fine, if open the assy and shut off shading it also looks fine, all edges are there, but as soon as I look at the file in edrawings the edges are missing when shading is shut off. It makes no sense to me.
Attached screen shots to show what's going on. Some are the 3d Model assy and the others are the drawing file. All are done in eDrawings though.