I just updated my Mac OS to Big Sur and reinstalled geant4-10.06-p03 along with QT5 and Xqaurtz. I get no problem while building or installing geant4 but when I run example B1 I get the following message:
qt.qpa.window: <QNSWindow: 0x7f9c706c9570; contentView=<QNSView: 0x7f9c72608b10; QCocoaWindow(0x7f9c72608930, window=QWidgetWindow(0x7f9c72607c30, name=“QGLWidgetClassWindow”))>> has active key-value observers (KVO)! These will stop working now that the window is recreated, and will result in exceptions when the observers are removed. Break in QCocoaWindow::recreateWindowIfNeeded to debug.
The visualisation window opens and there doesn’t seem to be any problem with that, but I am just wondering why I get this message and what it means as I haven’t seen it before with the Mac Catalina OS. Thank you very much in advance,