Just in case it helps, the layer break isn't added when you build the project, but when you format it (record to DVD-R, DLT tape, disk image, etc.) So, you'll have some feedback when you attempt to format. You may find out DVD SP doesn't find any suitable marker at that point. The best thing is to place a couple of marker in the proper point and set the break point to manual before formatting, if DVSD SP takes the layer break point you suggest, we're happy. If it doesn't, you will need to refine the search for the right spot (right after the middle of the project).
Adolfo Rozenfeld
Buenos Aires - Argentina
www.adolforozenfeld.com