Layouts "2 by 3", "Tall" and "Wide" are empty. The editor is white with only the menu bar. From there I can add the views I want but they are not embedded into the editor; they are independent. Furthermore, when I switch from one layout to the other I get these error messages: - from empty "2 by 3" to "4 split": - from "Default" to empty "Tall": - from empty "Tall" to empty "Wide":