Hi, When I try to open .ui.qml files in QtCreator panels not appear properly, they get black & does not work. Does any one knows to correct this problem. Following is the output on console when I open a file (I removed repeating lines because this get too long): void QWindow::setTransientParent(QWindow*) QWidgetWindow(0x36773e0, name = "QmlDesigner::Internal::DesignModeWidgetClassWindow") must be a top level window. libpng warning: iCCP: known incorrect sRGB profile QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings Process crashed: QProcess(0x3c52d70, name = "previewmode") exitCode: 0 QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings Process finished: QProcess(0x3c32c50, name = "editormode") exitCode: 0 QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState Process finished: QProcess(0x3c4dcc0, name = "rendermode") exitCode: 0 QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState Process crashed: QTimer(0x3c48fe0) exitCode: -1 QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState QAbstractSocket::waitForBytesWritten() is not allowed in UnconnectedState QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings QQuickWidget cannot be used as a native child widget. Consider setting Qt::AA_DontCreateNativeWidgetSiblings Thanks, Sadika