Level Management/Loading

I've created a scene, loaded it, and it looks great and functions. I have a sprite that I've added a control behavior to that allows me to move him around the screen. This is great, for a single level-but as I'm trying to build a framework for an RPG, I want the functionality to walk into houses/buildings/other map areas. I've written a function that, on collision, deletes the current scene window and then reinitializes another one with the same settings (only loading different objects/backgrounds). I'm calling the EXACT same functions to spawn my hero etc. However, when the second 'level' loads, it's got everything there but I'm not able to control my hero at all, as if the controls behavior did not bind correctly. I'm assuming this is because I've destroyed and recreated my scene without cleaning something up properly-or maybe I'm not managing levels in a way that makes sense? Here's relevant code below:

Here's the function to create the scenewindow:

function RPGGame::init( %this )
{
	// We need a main "Scene" we can use as our game world.  The place where sceneObjects play.
    // Give it a global name "mainScene" since we may want to access it directly in our scripts.
    %scene = new Scene(mainScene);
    

    // Without a system window or "Canvas", we can't see or interact with our scene.
    // AppCore initialized the Canvas already

    // Now that we have a Canvas, we need a viewport into the scene.
    // Give it a global name "mainWindow" since we may want to access it directly in our scripts.
    new SceneWindow(mainWindow);
    mainWindow.profile = new GuiControlProfile();
    Canvas.setContent(mainWindow);

    // Finally, connect our scene into the viewport (or sceneWindow).
    // Note that a viewport comes with a camera built-in.
    mainWindow.setScene(mainScene);
    mainWindow.setCameraPosition( 0, 0 );
    mainWindow.setCameraSize( 100, 75 );
    
    
    mainScene.setDebugOn( "aabb" );
    //mainWindow.setCameraSize(200, 150);
}

and to spawn the hero:

function RPGGame::spawnHero( %this )
{
	%anim = "RPGAssets:heroFrontStandAnim";
	%size = "5 5";
	
	%hero = new Sprite()
	{
		Animation = %anim;
		class = "Hero";
		position = "0 0";
		size = %size;
		SceneLayer = "15";
		SceneGroup = "15";
		minSpeed = "5";
		maxSpeed = "15";
		CollisionCallback = true;
	};
	
	%hero.setbodytype(dynamic);
	%hero.FixedAngle = true;
	%hero.heading = "south";
	%hero.createPolygonBoxCollisionShape(%size);
	%hero.setCollisionShapeIsSensor(0, false);
	%hero.setCollisionGroups( "15");
	
	//Set up Controls
	%controls = RPGControlsBehavior.createInstance();
	%hero.addBehavior(%controls);
	
	mainScene.add( %hero );
	
    	mainWindow.mount(%hero,"0 0", 10, false, 0);
}

and to rebuild the scene again (note that it calls the above two functions, exactly what it does to load the original level, only difference is I'm destroying the old scene first here):

function buildLevelTwo()
{
	destroySceneWindow();
	RPGGame.init(%this);
	RPGGame.spawnHero();
	addBackdrop( "RPGAssets:houseInterior", %scene );
	addAquariumBoundaries(mainScene, 80, 55);
}

Any idea what I'm missing?