diff --git a/src/away3d/containers/ObjectContainer3D.as b/src/away3d/containers/ObjectContainer3D.as
index 7891b9de1..eb890c107 100644
--- a/src/away3d/containers/ObjectContainer3D.as
+++ b/src/away3d/containers/ObjectContainer3D.as
@@ -340,7 +340,8 @@ package away3d.containers
 			var m : Number;
 			
 			while (i < len) {
-				m = _children[i++].minX;
+				var child:ObjectContainer3D = _children[i++];
+				m = child.minX + child.x;
 				if (m < min)
 					min = m;
 			}
@@ -359,7 +360,8 @@ package away3d.containers
 			var m : Number;
 			
 			while (i < len) {
-				m = _children[i++].minY;
+				var child:ObjectContainer3D = _children[i++];
+				m = child.minY + child.y;
 				if (m < min)
 					min = m;
 			}
@@ -378,7 +380,8 @@ package away3d.containers
 			var m : Number;
 			
 			while (i < len) {
-				m = _children[i++].minZ;
+				var child:ObjectContainer3D = _children[i++];
+				m = child.minZ + child.z;
 				if (m < min)
 					min = m;
 			}
@@ -398,7 +401,8 @@ package away3d.containers
 			var m : Number;
 			
 			while (i < len) {
-				m = _children[i++].maxX;
+				var child:ObjectContainer3D = _children[i++];
+				m = child.maxX + child.x;
 				if (m > max)
 					max = m;
 			}
@@ -417,7 +421,8 @@ package away3d.containers
 			var m : Number;
 			
 			while (i < len) {
-				m = _children[i++].maxY;
+				var child:ObjectContainer3D = _children[i++];
+				m = child.maxY + child.y;
 				if (m > max)
 					max = m;
 			}
@@ -436,7 +441,8 @@ package away3d.containers
 			var m : Number;
 			
 			while (i < len) {
-				m = _children[i++].maxZ;
+				var child:ObjectContainer3D = _children[i++];
+				m = child.maxZ + child.z;
 				if (m > max)
 					max = m;
 			}
@@ -599,6 +605,24 @@ package away3d.containers
 			
 			if (childIndex == -1) throw new Error("Parameter is not a child of the caller");
 			
+			removeChildInternal(childIndex, child);
+		}
+		
+		
+		/**
+		 * Removes a 3d object from the child array of the container
+		 *
+		 * @param	index	Index of 3d object to be removed
+		 */
+		public function removeChildAt(index:uint):void 
+		{
+			var child:ObjectContainer3D = _children[index];
+			
+			removeChildInternal(index, child);
+		}
+		
+		private function removeChildInternal(childIndex:uint, child:ObjectContainer3D):void
+		{
 			// index is important because getChildAt needs to be regular.
 			_children.splice(childIndex, 1);
 			
diff --git a/src/away3d/containers/Scene3D.as b/src/away3d/containers/Scene3D.as
index 91350db21..7afdc8e46 100644
--- a/src/away3d/containers/Scene3D.as
+++ b/src/away3d/containers/Scene3D.as
@@ -90,6 +90,16 @@ package away3d.containers
 			_sceneGraphRoot.removeChild(child);
 		}
 
+		/**
+		 * Removes a child from the scene's root.
+		 * @param index Index of child to be removed from the scene.
+		 */
+		public function removeChildAt(index : uint) : void
+		{
+			_sceneGraphRoot.removeChildAt(index);
+		}
+		
+		
 		/**
 		 * Retrieves the child with the given index
 		 * @param index The index for the child to be retrieved.
diff --git a/src/away3d/core/base/CompactSubGeometry.as b/src/away3d/core/base/CompactSubGeometry.as
index 060480f6b..767d2cca9 100644
--- a/src/away3d/core/base/CompactSubGeometry.as
+++ b/src/away3d/core/base/CompactSubGeometry.as
@@ -55,6 +55,11 @@ package away3d.core.base
 			var numVertices : int = _vertexData.length / 13;
 			if (numVertices != _numVertices) disposeVertexBuffers(_vertexBuffer);
 			_numVertices = numVertices;
+			
+			if (_numVertices == 0)
+			{
+				throw new Error("Bad data: geometry can't have zero triangles");
+			}
 
 			invalidateBuffers(_vertexDataInvalid);
 
diff --git a/src/away3d/core/base/SubGeometryBase.as b/src/away3d/core/base/SubGeometryBase.as
index e29e00217..b62ef3e14 100644
--- a/src/away3d/core/base/SubGeometryBase.as
+++ b/src/away3d/core/base/SubGeometryBase.as
@@ -673,6 +673,7 @@ package away3d.core.base
 					vector.y = normals[i1];
 					vector.z = normals[i2];
 					vector = invTranspose.deltaTransformVector(vector);
+					vector.normalize();
 					normals[ni0] = vector.x;
 					normals[i1] = vector.y;
 					normals[i2] = vector.z;
@@ -688,6 +689,7 @@ package away3d.core.base
 					vector.y = tangents[i1];
 					vector.z = tangents[i2];
 					vector = invTranspose.deltaTransformVector(vector);
+					vector.normalize();
 					tangents[ti0] = vector.x;
 					tangents[i1] = vector.y;
 					tangents[i2] = vector.z;
diff --git a/src/away3d/core/managers/Mouse3DManager.as b/src/away3d/core/managers/Mouse3DManager.as
index eff186561..7110c7285 100644
--- a/src/away3d/core/managers/Mouse3DManager.as
+++ b/src/away3d/core/managers/Mouse3DManager.as
@@ -53,7 +53,6 @@ package away3d.core.managers
 
 		public function updateCollider(view : View3D) : void
 		{
-			_previousCollidingObject = _collidingObject;
 
 			if (view == _activeView && (_forceMouseMove || _updateDirty)) { // If forceMouseMove is off, and no 2D mouse events dirtied the update, don't update either.
 				_collidingObject = _mousePicker.getViewCollision(view.mouseX, view.mouseY, view);
@@ -94,6 +93,8 @@ package away3d.core.managers
 					dispatcher.dispatchEvent(event);
 			}
 			_queuedEvents.length = 0;
+			
+			_previousCollidingObject = _collidingObject;
 		}
 
 		// ---------------------------------------------------------------------
diff --git a/src/away3d/loaders/parsers/OBJParser.as b/src/away3d/loaders/parsers/OBJParser.as
index 644d7cb91..6682e7f6c 100644
--- a/src/away3d/loaders/parsers/OBJParser.as
+++ b/src/away3d/loaders/parsers/OBJParser.as
@@ -355,10 +355,12 @@ package away3d.loaders.parsers
 					translateVertexData(face, j+1, vertices, uvs, indices, normals);
 				}
 			}
-			
-			subs = GeomUtil.fromVectors(vertices, indices, uvs, normals, null, null, null);
-			for (i=0; i<subs.length; i++) {
-				geometry.addSubGeometry(subs[i]);
+			if (vertices.length > 0)
+			{
+				subs = GeomUtil.fromVectors(vertices, indices, uvs, normals, null, null, null);
+				for (i=0; i<subs.length; i++) {
+					geometry.addSubGeometry(subs[i]);
+				}
 			}
 		}