I saved as the iso file as you suggested. However, in my original project when I saved it as a DVD, I went thru the process of creating menus and submenus with chapter points at the desired locations. Then I tweaked the text and after saving the project and burning to DVD all works ok. When I save as an iso and burn to DVD, there are NO Menus just the movie.
Did I forget a step? Is it possible to save the menus on the iso file? If I have to go thru the trouble each time of recreating the menu and chapter points this method may not be worth the time savings, but may have archival value.