Running qSlicerParticlesDisplayModuleGenericTest allows to reproduce the problem.
23: Class "vtkCellData" has 2 instances still around.
23: Class "vtkTransformPolyDataFilter" has 1 instance still around.
23: Class "vtkInformationVector" has 11 instances still around.
23: Class "vtkPointData" has 2 instances still around.
23: Class "vtkCompositeDataPipeline" has 3 instances still around.
23: Class "vtkMatrix4x4" has 2 instances still around.
23: Class "vtkSimpleTransform" has 1 instance still around.
23: Class "vtkPoints" has 2 instances still around.
23: Class "vtkInformation" has 33 instances still around.
23: Class "vtkInformationStringVectorValue" has 1 instance still around.
23: Class "vtkPolyData" has 2 instances still around.
23: Class "vtkCylinderSource" has 1 instance still around.
23: Class "vtkAlgorithmOutput" has 1 instance still around.
23: Class "vtkInformationIntegerValue" has 56 instances still around.
23: Class "vtkCellArray" has 1 instance still around.
23: Class "vtkFloatArray" has 5 instances still around.
23: Class "vtkInformationStringValue" has 2 instances still around.
23: Class "vtkInformationExecutivePortVectorValue" has 1 instance still around.
23: Class "vtkIdTypeArray" has 1 instance still around.
23: Class "vtkTransform" has 1 instance still around.
23: Class "vtkFieldData" has 2 instances still around.
23: Class "vtkSphereSource" has 1 instance still around.
23: Class "vtkCommand or subclass" has 2 instances still around.
23: Class "vtkInformationExecutivePortValue" has 2 instances still around.
Running
qSlicerParticlesDisplayModuleGenericTest
allows to reproduce the problem.