Could you paste your widget destructor? I use QVTKWidget regularly and in the QDialog (or other kind of parent) destructor I just delete ui. -- View this message in context: http://vtk.1045678.n5.nabble.com/How-avoid-QVTKWidget-crash-on-exit-tp5735601p5735603.html Sent from the VTK - Users mailing list archive at Nabble.com.