Hey berry, if your working with a lot of objects spread over different layers these tips should have you working efficiently again.
1. On the right hand side click on your layers tab, select a layer and tick the box on the left hand side "Parallax in editor" under editor properties.
2. Set the "View" in the view tab along the top to "Zoom to 100%". Now when you place things on the layers - thats where they will be in game.