I have completed making several yards, but I am having problems with the latest one. For some strange reason tracks keep disappearing from the yard. It is just small pieces near the switch. I make the fix, go to driver mode and it is fine. I exit driver mode and go back to editing the route and a piece of track is missing. This seemed to happen after I started adding some dwarf signals. I am just scratching my head... Not sure if I have the switches too close together or something else. Hopefully someone can chime in here and offer some suggestions.