For me this issue is resolved now by using the newest Qt Version (I used the 5.5.0 branch) on the Raspberry Pi. It looks like it might have also been related to other issues on the RaspberryPi like http://forum.qt.io/topic/50854/raspberry-pi-and-stackview/2 or https://bugreports.qt.io/browse/QTBUG-44295 since I was also using the StackView control.