QT design studio, 4.3.0, Built on Sep 29 2023 13:15:34, Windows 11 PC. QT 6.6.0 is installed. I am on an evaluation license.

While evaluating QT for possible use at our company, I played with the  designer. I have multiple QML files in a project,  and I edited one in the  the design mode so I can see the immediate effects.

Then this crashed with  "Line 1: Qt Quick emulation layer crashed" (see attached *.png). Other  QML files are still shown ok. Restarting the studio does not help. I attach the qml code, which is basically just a copy from a QT demo.

The output pane did not show anything.

Search in Qt forums (mostly old entries ) told about a "navigation plugin" but I did not find that.

import QtQuick
import QtQuick.Controls
import QtQuick.Layouts

ColumnLayout {
spacing: 2
margins: 0

Rectangle

{ color: "#ff0000" Layout.preferredWidth: 40 Layout.preferredHeight: 40 Layout.alignment: Qt.AlignCenter }

Rectangle

{ color: "#008000" Layout.preferredWidth: 40 Layout.preferredHeight: 70 Layout.alignment: Qt.AlignRight }

Rectangle

{ color: "#0000ff" Layout.preferredWidth: 40 Layout.preferredHeight: 70 Layout.fillHeight: true Layout.alignment: Qt.AlignBottom }

}