diff --git a/BasePlugin/PluginFunctions.cc b/BasePlugin/PluginFunctions.cc
index e76bd28fc470d98ffccea8c6da67471c3ecfaabd..5130864f18e597d8a41d768e8412724c0918a0bf 100644
--- a/BasePlugin/PluginFunctions.cc
+++ b/BasePlugin/PluginFunctions.cc
@@ -448,8 +448,9 @@ bool scenegraphRegionPick( const unsigned int                         _examiner,
 
 //Warning : Dont use template function as external static pointer for examiner widget is not resolved correctly!!
 void traverse( ACG::SceneGraph::MouseEventAction  &_action ) {
-   ACG::SceneGraph::traverse(sceneGraphRootNode_,
-                             _action,viewerProperties().glState() );
+  // Single pass action, as the mouse action will only update the graph.
+  // If its changed, it will be set to dirty and an automatic redraw is triggered.
+  ACG::SceneGraph::traverse(sceneGraphRootNode_, _action,viewerProperties().glState() );
 }
 
 //Warning : Dont use template function as external static pointer for examiner widget is not resolved correctly!!
@@ -460,6 +461,8 @@ void traverse( const unsigned int _examiner, ACG::SceneGraph::MouseEventAction
     return;
   }
 
+  // Single pass action, as the mouse action will only update the graph.
+  // If its changed, it will be set to dirty and an automatic redraw is triggered.
   ACG::SceneGraph::traverse(sceneGraphRootNode_, _action,viewerProperties(_examiner).glState() );
 }
 
diff --git a/Core/Core.cc b/Core/Core.cc
index 0a82ecf17c58e630e34a763bada44d81b221ea69..1ec217ac055659bc69ec031b92f037505b4bdbed 100644
--- a/Core/Core.cc
+++ b/Core/Core.cc
@@ -769,8 +769,11 @@ void Core::updateView() {
 void Core::checkScenegraphDirty() {
   if ( true )
   {
+    // This is a single pass traversal as we only need to check if there is still one node dirty in the graph
     ACG::SceneGraph::CheckDirtyAction action;
     ACG::SceneGraph::traverse( root_node_scenegraph_, action );
+    
+    // If the scenegraph is dirty, we have to redraw
     if ( action.isDirty () )
       emit updateView ();
   }
diff --git a/Core/PluginLoader.cc b/Core/PluginLoader.cc
index 92b1522b4a5dc43a2dba818c9aa8ad06caeea6f9..6d94c9126abc62342010e7a388072460fad2be5a 100644
--- a/Core/PluginLoader.cc
+++ b/Core/PluginLoader.cc
@@ -1140,6 +1140,8 @@ void Core::loadPlugin(QString filename, bool silent){
       ft.loadFilters = filePlugin->getLoadFilters();
       ft.saveFilters = filePlugin->getSaveFilters();
       ft.plugin = filePlugin;
+      
+      std::cerr << ft.type << std::endl;
 
       supportedTypes_.push_back(ft);
     }
diff --git a/common/BaseObjectData.cc b/common/BaseObjectData.cc
index 903842596843243935e0fc2f9bdd1a5983339441..bb65c3577b63dc8b9687ff06a055d58679c2b5e5 100644
--- a/common/BaseObjectData.cc
+++ b/common/BaseObjectData.cc
@@ -251,6 +251,7 @@ void BaseObjectData::manipPlaced( bool _placed ) {
 
 void BaseObjectData::getBoundingBox(ACG::Vec3d& bbmin, ACG::Vec3d& bbmax){
 
+  // Single pass action, as the bounding box is not influenced by multipass traversal
   ACG::SceneGraph::BoundingBoxAction act;
   ACG::SceneGraph::traverse(separatorNode_, act);