Edit Menuitems Disappeared

Hi,

I use Edit > Column Mode and Edit > Duplicate Block quite a bit Yesterday they mysteriously disappared from my Edit menu. Does anyone know how I can get them back?

1) I did *not* make any changes to Settings > Menus and Toolbars > Main Menu > Edit. As a matter of fact, when I look at that I see "Column Mode" and "Duplicate Line or Block" are present - but they don't show up in the application.

2) Settings > Menus and Toolbars >Restore Defaults is not an option for me because I spent a LONG time customizing my menus, and hitting that button will wipe out every change that I made.

Thanks,
Larry