Thanks for your efforts. As you said it works in a project I have a second look at my code. I'm not writing a Quick-App but a QWidget-App and use the map inside a QQuickWidget. I have read about another approach to embed qml content in a QWidget-App using QQuickView inside a QObject-Container. This approach works as expected. I don't know why it doesn't work with a QQuickWidget but my problem is solved. Best Regards

Has any one experienced the same problem ? Any idea of a possible workaround ? Thanks for your help.