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This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

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Actually, vtkInteractorObserver class destructor make a call to "this->SetEnabled (0);"

The problem is that in c++, the virtual dispatching mechanism has a different semantics during construction and destruction of an object. So in this case, when we proceed to the destruction of a vtkInteractorObserver object, the SetEnabled(int) called method is the vtkInteractorObserver class definition (which is empty) and not the respective daughter method definition.

In other word, "this->SetEnabled(0);" call in the vtkInteractorObserver object destructor is useless, and all specialized classes are never disable itself at destruction.