diff --git a/Modules/Segmentation/Controllers/mitkSurfaceInterpolationController.cpp b/Modules/Segmentation/Controllers/mitkSurfaceInterpolationController.cpp
index ca4e122ae0..6fd637edd6 100644
--- a/Modules/Segmentation/Controllers/mitkSurfaceInterpolationController.cpp
+++ b/Modules/Segmentation/Controllers/mitkSurfaceInterpolationController.cpp
@@ -1,290 +1,295 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #include "mitkSurfaceInterpolationController.h"
 #include "mitkMemoryUtilities.h"
 
 mitk::SurfaceInterpolationController::SurfaceInterpolationController()
   :m_SelectedSegmentation(0)
 {
   m_ReduceFilter = ReduceContourSetFilter::New();
   m_NormalsFilter = ComputeContourSetNormalsFilter::New();
   m_InterpolateSurfaceFilter = CreateDistanceImageFromSurfaceFilter::New();
 
   m_ReduceFilter->SetUseProgressBar(false);
   m_NormalsFilter->SetUseProgressBar(false);
   m_InterpolateSurfaceFilter->SetUseProgressBar(false);
 
   m_Contours = Surface::New();
 
   m_PolyData = vtkSmartPointer<vtkPolyData>::New();
   m_PolyData->SetPoints(vtkPoints::New());
 
   m_InterpolationResult = 0;
   m_CurrentNumberOfReducedContours = 0;
 }
 
 mitk::SurfaceInterpolationController::~SurfaceInterpolationController()
 {
   ContourListMap::iterator it = m_MapOfContourLists.begin();
   for (; it != m_MapOfContourLists.end(); it++)
   {
       for (unsigned int j = 0; j < m_MapOfContourLists[(*it).first].size(); ++j)
       {
           delete(m_MapOfContourLists[(*it).first].at(j).position);
       }
       m_MapOfContourLists.erase(it);
   }
 
   //Removing all observers
   std::map<mitk::Image*, unsigned long>::iterator dataIter = m_SegmentationObserverTags.begin();
   for (; dataIter != m_SegmentationObserverTags.end(); ++dataIter )
   {
     (*dataIter).first->GetProperty("visible")->RemoveObserver( (*dataIter).second );
   }
   m_SegmentationObserverTags.clear();
 }
 
 mitk::SurfaceInterpolationController* mitk::SurfaceInterpolationController::GetInstance()
 {
   static mitk::SurfaceInterpolationController* m_Instance;
 
   if ( m_Instance == 0)
   {
     m_Instance = new SurfaceInterpolationController();
   }
 
   return m_Instance;
 }
 
 void mitk::SurfaceInterpolationController::AddNewContour (mitk::Surface::Pointer newContour ,RestorePlanePositionOperation* op)
 {
   AffineTransform3D::Pointer transform = AffineTransform3D::New();
   transform = op->GetTransform();
 
   mitk::Vector3D direction = op->GetDirectionVector();
   int pos (-1);
 
   for (unsigned int i = 0; i < m_MapOfContourLists[m_SelectedSegmentation].size(); i++)
   {
       itk::Matrix<float> diffM = transform->GetMatrix()-m_MapOfContourLists[m_SelectedSegmentation].at(i).position->GetTransform()->GetMatrix();
       bool isSameMatrix(true);
       for (unsigned int j = 0; j < 3; j++)
       {
         if (fabs(diffM[j][0]) > 0.0001 && fabs(diffM[j][1]) > 0.0001 && fabs(diffM[j][2]) > 0.0001)
         {
           isSameMatrix = false;
           break;
         }
       }
       itk::Vector<float> diffV = m_MapOfContourLists[m_SelectedSegmentation].at(i).position->GetTransform()->GetOffset()-transform->GetOffset();
       if ( isSameMatrix && m_MapOfContourLists[m_SelectedSegmentation].at(i).position->GetPos() == op->GetPos() && (fabs(diffV[0]) < 0.0001 && fabs(diffV[1]) < 0.0001 && fabs(diffV[2]) < 0.0001) )
       {
         pos = i;
         break;
       }
 
   }
 
   //Don't save a new empty contour
   if (pos == -1 && newContour->GetVtkPolyData()->GetNumberOfPoints() > 0)
   {
     mitk::RestorePlanePositionOperation* newOp = new mitk::RestorePlanePositionOperation (OpRESTOREPLANEPOSITION, op->GetWidth(),
       op->GetHeight(), op->GetSpacing(), op->GetPos(), direction, transform);
     ContourPositionPair newData;
     newData.contour = newContour;
     newData.position = newOp;
 
     m_ReduceFilter->SetInput(m_MapOfContourLists[m_SelectedSegmentation].size(), newContour);
     m_MapOfContourLists[m_SelectedSegmentation].push_back(newData);
   }
   //Edit a existing contour. If the contour is empty, edit it anyway so that the interpolation will always be consistent
   else if (pos != -1)
   {
     m_MapOfContourLists[m_SelectedSegmentation].at(pos).contour = newContour;
     m_ReduceFilter->SetInput(pos, newContour);
   }
 
   m_ReduceFilter->Update();
   m_CurrentNumberOfReducedContours = m_ReduceFilter->GetNumberOfOutputs();
 
   for (unsigned int i = 0; i < m_CurrentNumberOfReducedContours; i++)
   {
     m_NormalsFilter->SetInput(i, m_ReduceFilter->GetOutput(i));
     m_InterpolateSurfaceFilter->SetInput(i, m_NormalsFilter->GetOutput(i));
   }
 
   this->Modified();
 }
 
 void mitk::SurfaceInterpolationController::Interpolate()
 {
   if (m_CurrentNumberOfReducedContours< 2)
   {
     //If no interpolation is possible reset the interpolation result
     m_InterpolationResult = 0;
     return;
   }
 
   //Setting up progress bar
    /*
     * Removed due to bug 12441. ProgressBar messes around with Qt event queue which is fatal for segmentation
     */
   //mitk::ProgressBar::GetInstance()->AddStepsToDo(8);
 
   m_InterpolateSurfaceFilter->Update();
 
   Image::Pointer distanceImage = m_InterpolateSurfaceFilter->GetOutput();
 
   vtkSmartPointer<vtkMarchingCubes> mcFilter = vtkSmartPointer<vtkMarchingCubes>::New();
   mcFilter->SetInput(distanceImage->GetVtkImageData());
   mcFilter->SetValue(0,0);
   mcFilter->Update();
 
   m_InterpolationResult = 0;
   m_InterpolationResult = mitk::Surface::New();
   m_InterpolationResult->SetVtkPolyData(mcFilter->GetOutput());
   m_InterpolationResult->GetGeometry()->SetOrigin(distanceImage->GetGeometry()->GetOrigin());
 
   vtkSmartPointer<vtkAppendPolyData> polyDataAppender = vtkSmartPointer<vtkAppendPolyData>::New();
   for (unsigned int i = 0; i < m_ReduceFilter->GetNumberOfOutputs(); i++)
   {
     polyDataAppender->AddInput(m_ReduceFilter->GetOutput(i)->GetVtkPolyData());
   }
   polyDataAppender->Update();
   m_Contours->SetVtkPolyData(polyDataAppender->GetOutput());
 
   //Last progress step
   /*
    * Removed due to bug 12441. ProgressBar messes around with Qt event queue which is fatal for segmentation
    */
   //mitk::ProgressBar::GetInstance()->Progress(8);
 
   m_InterpolationResult->DisconnectPipeline();
 }
 
 mitk::Surface::Pointer mitk::SurfaceInterpolationController::GetInterpolationResult()
 {
     return m_InterpolationResult;
 }
 
 mitk::Surface* mitk::SurfaceInterpolationController::GetContoursAsSurface()
 {
   return m_Contours;
 }
 
 void mitk::SurfaceInterpolationController::SetDataStorage(DataStorage &ds)
 {
   m_DataStorage = &ds;
 }
 
 void mitk::SurfaceInterpolationController::SetMinSpacing(double minSpacing)
 {
   m_ReduceFilter->SetMinSpacing(minSpacing);
 }
 
 void mitk::SurfaceInterpolationController::SetMaxSpacing(double maxSpacing)
 {
   m_ReduceFilter->SetMaxSpacing(maxSpacing);
   m_NormalsFilter->SetMaxSpacing(maxSpacing);
 }
 
 void mitk::SurfaceInterpolationController::SetDistanceImageVolume(unsigned int distImgVolume)
 {
   m_InterpolateSurfaceFilter->SetDistanceImageVolume(distImgVolume);
 }
 
 void mitk::SurfaceInterpolationController::SetSegmentationImage(Image* workingImage)
 {
   m_NormalsFilter->SetSegmentationBinaryImage(workingImage);
 }
 
 mitk::Image* mitk::SurfaceInterpolationController::GetImage()
 {
   return m_InterpolateSurfaceFilter->GetOutput();
 }
 
 double mitk::SurfaceInterpolationController::EstimatePortionOfNeededMemory()
 {
   double numberOfPointsAfterReduction = m_ReduceFilter->GetNumberOfPointsAfterReduction()*3;
   double sizeOfPoints = pow(numberOfPointsAfterReduction,2)*sizeof(double);
   double totalMem = mitk::MemoryUtilities::GetTotalSizeOfPhysicalRam();
   double percentage = sizeOfPoints/totalMem;
   return percentage;
 }
 
 void mitk::SurfaceInterpolationController::SetCurrentSegmentationInterpolationList(mitk::Image* segmentation)
 {
   if (segmentation == m_SelectedSegmentation)
     return;
 
   if (segmentation == 0)
     return;
 
   ContourListMap::iterator it = m_MapOfContourLists.find(segmentation);
 
   m_SelectedSegmentation = segmentation;
 
   m_ReduceFilter->Reset();
   m_NormalsFilter->Reset();
   m_InterpolateSurfaceFilter->Reset();
 
   if (it == m_MapOfContourLists.end())
   {
     ContourPositionPairList newList;
     m_MapOfContourLists.insert(std::pair<mitk::Image*, ContourPositionPairList>(segmentation, newList));
     m_InterpolationResult = 0;
     m_CurrentNumberOfReducedContours = 0;
+
+    itk::MemberCommand<SurfaceInterpolationController>::Pointer command = itk::MemberCommand<SurfaceInterpolationController>::New();
+    command->SetCallbackFunction(this, &SurfaceInterpolationController::OnSegmentationDeleted);
+    m_SegmentationObserverTags.insert( std::pair<mitk::Image*, unsigned long>( segmentation, segmentation->AddObserver( itk::DeleteEvent(), command ) ) );
+
   }
   else
   {
     for (unsigned int i = 0; i < m_MapOfContourLists[m_SelectedSegmentation].size(); i++)
     {
       m_ReduceFilter->SetInput(i, m_MapOfContourLists[m_SelectedSegmentation].at(i).contour);
     }
 
     m_ReduceFilter->Update();
 
     m_CurrentNumberOfReducedContours = m_ReduceFilter->GetNumberOfOutputs();
 
     for (unsigned int i = 0; i < m_CurrentNumberOfReducedContours; i++)
     {
       m_NormalsFilter->SetInput(i, m_ReduceFilter->GetOutput(i));
       m_InterpolateSurfaceFilter->SetInput(i, m_NormalsFilter->GetOutput(i));
     }
   }
   Modified();
 }
 
 void mitk::SurfaceInterpolationController::RemoveSegmentationFromContourList(mitk::Image *segmentation)
 {
   if (segmentation != 0)
   {
     m_MapOfContourLists.erase(segmentation);
 void mitk::SurfaceInterpolationController::OnSegmentationDeleted(const itk::Object *caller, const itk::EventObject &/*event*/)
 {
   MITK_INFO<< "SegmentationRemoved!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!";
   mitk::Image* tempImage = dynamic_cast<mitk::Image*>(const_cast<itk::Object*>(caller));
   if (tempImage)
   {
     RemoveSegmentationFromContourList(tempImage);
     if (tempImage == m_SelectedSegmentation)
     {
       SetSegmentationImage(NULL);
       m_SelectedSegmentation = 0;
     }
   }
 }