Refactored the Screen/Scene loading mechanics a bit. Now loading scenes from Runtime works perfectly, both from startup scene, or any other scene (whether they're part of a Screen that only have a single Main Scene, or a Screen that holds multiple Sub Scenes as well). There's a strange bug when loading from the Working directory right now in that it loads a scene id with -1 the index actually specified for Main and Sub scenes... Will try a fix next that replaces int id loading for string name based Level/Scene loading.