qwidget?

Shutting down my KDE I get a lot of error information about qwidget who seem to complain that a negative value is not possible. I have no idea where to look in order to get rid of this errors. What are qwidgets and where are they maintained? I am running SuSe 8.0. -- NTReader v0.36w(P)/Beta (Registered) in conjunction with Net-Tamer.