diff --git a/include/osgAnimation/Action b/include/osgAnimation/Action
index 7f81f29b8..b61e45c39 100644
--- a/include/osgAnimation/Action
+++ b/include/osgAnimation/Action
@@ -51,10 +51,12 @@ namespace osgAnimation
             Callback* getNestedCallback() { return _nestedCallback.get(); } 
             void addNestedCallback(Callback* callback) 
             { 
-                if (_nestedCallback.valid())
-                    _nestedCallback->addNestedCallback(callback);
-                else
-                    _nestedCallback = callback;
+                if (callback) {
+                    if (_nestedCallback.valid())
+                        _nestedCallback->addNestedCallback(callback);
+                    else
+                        _nestedCallback = callback;
+                }
             }
 
             void removeCallback(Callback* cb)
@@ -64,7 +66,7 @@ namespace osgAnimation
 
                 if (_nestedCallback.get() == cb)
                     _nestedCallback = _nestedCallback->getNestedCallback();
-                else
+                else if (_nestedCallback.valid())
                     _nestedCallback->removeCallback(cb);
             }
 
diff --git a/include/osgAnimation/TimelineAnimationManager b/include/osgAnimation/TimelineAnimationManager
index 329ab9a17..7392b0c72 100644
--- a/include/osgAnimation/TimelineAnimationManager
+++ b/include/osgAnimation/TimelineAnimationManager
@@ -1,5 +1,5 @@
 /*  -*-c++-*- 
- *  Copyright (C) 2008 Cedric Pinson <mornifle@plopbyte.net>
+ *  Copyright (C) 2008 Cedric Pinson <cedric.pinson@plopbyte.net>
  *
  * This library is open source and may be redistributed and/or modified under  
  * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
@@ -10,7 +10,7 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
  * OpenSceneGraph Public License for more details.
-*/
+ */
 
 #ifndef OSGANIMATION_TIMELINE_ANIMATION_MANAGER_H
 #define OSGANIMATION_TIMELINE_ANIMATION_MANAGER_H
diff --git a/include/osgAnimation/UpdateCallback b/include/osgAnimation/UpdateCallback
index 8f50f697f..a2cb32a4e 100644
--- a/include/osgAnimation/UpdateCallback
+++ b/include/osgAnimation/UpdateCallback
@@ -37,11 +37,15 @@ namespace osgAnimation
     class AnimationUpdateCallback : public AnimationUpdateCallbackBase, public T
     {
     public:
+        AnimationUpdateCallback() {}
         AnimationUpdateCallback(const std::string& name) { T::setName(name);}
         AnimationUpdateCallback(const AnimationUpdateCallback& apc,const osg::CopyOp& copyop):
             T(apc, copyop) {}
 
+        META_Object(osgAnimation, AnimationUpdateCallback<T>);
+
         const std::string& getName() const { return T::getName(); }
+        bool link(osgAnimation::Channel* channel) { return 0; }
         int link(osgAnimation::Animation* animation)
         {
             if (T::getName().empty())
diff --git a/src/osgAnimation/ActionVisitor.cpp b/src/osgAnimation/ActionVisitor.cpp
index 79ab54477..32f6d9002 100644
--- a/src/osgAnimation/ActionVisitor.cpp
+++ b/src/osgAnimation/ActionVisitor.cpp
@@ -140,8 +140,9 @@ void UpdateActionVisitor::apply(ActionAnimation& action)
     {
         unsigned int frame = getLocalFrame();
         apply(static_cast<Action&>(action));
-//        action.updateAnimation(frame, getCurrentLayer());
-        action.updateAnimation(frame, -_currentAnimationPriority++);
+		int pri = static_cast<int>(_currentAnimationPriority);
+		_currentAnimationPriority++;
+        action.updateAnimation(frame, -pri);
     }
 }
 
diff --git a/src/osgAnimation/StatsHandler.cpp b/src/osgAnimation/StatsHandler.cpp
index 745bc9b6b..7c34756af 100644
--- a/src/osgAnimation/StatsHandler.cpp
+++ b/src/osgAnimation/StatsHandler.cpp
@@ -424,8 +424,7 @@ struct ValueTextDrawCallback : public virtual osg::Drawable::DrawCallback
             pos.y() -= characterSize *2 + backgroundMargin;
 
              for (std::map<std::string, StatAction >::iterator it = _actions.begin(); it != _actions.end(); it++) {
-                 //if ((*it).second.update())
-                 (*it).second._group->setNodeMask(~1);
+                 (*it).second._group->setNodeMask(~osg::Node::NodeMask(1));
              }
 
             const std::vector<std::string>& channels = visitor->getChannels();
@@ -441,7 +440,7 @@ struct ValueTextDrawCallback : public virtual osg::Drawable::DrawCallback
                     _actions[name].setPosition(pos);
                     //_actions[name].touch();
                 }
-                _actions[name]._group->setNodeMask(~0);
+				_actions[name]._group->setNodeMask(~osg::Node::NodeMask(0x0));
                 size[name] = 0;
                 pos.y() -= characterSize + graphSpacing;
             }
diff --git a/src/osgAnimation/StatsVisitor.cpp b/src/osgAnimation/StatsVisitor.cpp
index bd7ff0114..8106ca708 100644
--- a/src/osgAnimation/StatsVisitor.cpp
+++ b/src/osgAnimation/StatsVisitor.cpp
@@ -77,6 +77,10 @@ void StatsActionVisitor::apply(ActionStripAnimation& action)
     if (isActive(action))
     {
         _channels.push_back(action.getName());
-        _stats->setAttribute(_frame,action.getName(), action.getAnimation()->getAnimation()->getWeight());
+        double value;
+        std::string name = action.getName();
+        if (_stats->getAttribute(_frame, name, value))
+            name += "+";
+        _stats->setAttribute(_frame, action.getName(), action.getAnimation()->getAnimation()->getWeight());
     }
 }