We have some sheet metal parts with multiple configurations and multiple bend lines.  When we create the drawings, we have SolidWorks create the flat pattern drawings for these configurations.  Everything seems to be fine with these projects when it its saved and closed.  Often when the project is opened again, some of the bend lines are suppressed, not the entire flat pattern just some of the bends.

Has anyone else seen this problem?  Does anyone know why this would happen.