On Wed, Aug 29, 2012 at 8:56 PM, septem <septem.wu at gmail.com> wrote: > I am working on Windows7 with Qt4.8.2 and VTk5.10. > All are x64. > Thank you. > I vaguely remember a bug (not sure if it was fixed) where the window could flicker if Aero was turned off. Could this be the case? John