The original design was a two bedroom. I have added a 3rd bedroom. When I go to auto build roof, it resorts back to the two bedroom roof line. If I open the build roof properties and check Build roof, uncheck Auto roof planes, and then uncheck Use existing roof baselines, the roof generates properly. The problem is I want to add some gable roof lines. To do this I have to have the auto roof planes on. At that point it reverts back to the two bedroom roof line plan.