Hi, I wrote this problem already into the QtForum and there it was suggested to report the found problem as a bug.
I created a normal widget project in QtCreator. In the main form I added a TabWidget and in the first tab I added a QQuickWidget.
Into this QQuickWidget I loaded a QML file displaying a green rectangle and a StatusIndicator (import QtQuick.Extras 1.4).
If I now start the application I can see the rectangle and the StatusIndicator in the QQuickWidget. If I now change the tab to the second and back the green rectangle is still visible, but the StatusIndicator is gone!
I tested this with Qt5.4.0 on Win7 and Qt5.5.1 on Mac.
Please help me to solve this problem.
Thank you very much