The views I was adding to the wizard I had already written a while back and they are all derived from QWidget which QWizardPage inherits so I just thought they would be ok without having to change their base class, ok, I should have thought more on this and obvioulsy the constructor for QWizardPage does more behind the scenes. Before the post back from High Flyer I had actually changed one of them to derive from QWizardPage, sorry to have not posted back to say I'd fixed it.