diff --git a/qmlui/fixturemanager.cpp b/qmlui/fixturemanager.cpp
index 0cb0f0a2bd..e1b725c28f 100644
--- a/qmlui/fixturemanager.cpp
+++ b/qmlui/fixturemanager.cpp
@@ -1431,8 +1431,8 @@ QVariantList FixtureManager::fixturesMap()
      * Fixture ID | DMX address | isOdd | channel type (a lookup for icons)
      */
 
-    m_fixturesMap.clear();
-    m_fixtureNamesMap.clear();
+    QVariantList fixturesMap;
+    QVariantList fixtureNamesMap;
 
     QList<Fixture*> origList = m_doc->fixtures();
     // sort the fixture list by address and not by ID
@@ -1449,32 +1449,45 @@ QVariantList FixtureManager::fixturesMap()
         quint32 startAddress = fx->address();
         for (quint32 cn = 0; cn < fx->channels(); cn++)
         {
-            m_fixturesMap.append(fx->id());
-            m_fixturesMap.append(startAddress + cn);
+            fixturesMap.append(fx->id());
+            fixturesMap.append(startAddress + cn);
 
             if (odd)
-                m_fixturesMap.append(1);
+                fixturesMap.append(1);
             else
-                m_fixturesMap.append(0);
+                fixturesMap.append(0);
 
             QLCChannel::Group group = fx->channel(cn)->group();
             if (group == QLCChannel::Intensity)
-                m_fixturesMap.append(fx->channel(cn)->colour());
+                fixturesMap.append(fx->channel(cn)->colour());
             else
-                m_fixturesMap.append(group);
+                fixturesMap.append(group);
         }
         odd = !odd;
 
-        m_fixtureNamesMap.append(fx->id());
-        m_fixtureNamesMap.append(fx->address());
-        m_fixtureNamesMap.append(fx->channels());
-        m_fixtureNamesMap.append(fx->name());
+        fixtureNamesMap.append(fx->id());
+        fixtureNamesMap.append(fx->address());
+        fixtureNamesMap.append(fx->channels());
+        fixtureNamesMap.append(fx->name());
     }
+    setFixturesMap(fixturesMap);
+    setFixtureNamesMap(fixtureNamesMap);
 
+    return fixturesMap;
+}
+
+void FixtureManager::setFixturesMap(QVariantList fixturesMap){
+    if(fixturesMap == m_fixturesMap)
+        return;
+    m_fixturesMap = fixturesMap;
     emit fixturesMapChanged();
-    emit fixtureNamesMapChanged();
+}
 
-    return m_fixturesMap;
+void FixtureManager::setFixtureNamesMap(QVariantList fixtureNamesMap){
+    if(fixtureNamesMap == m_fixtureNamesMap)
+        return;
+    m_fixtureNamesMap = fixtureNamesMap;
+    emit fixtureNamesMapChanged();
 }
 
 int FixtureManager::pasteFromClipboard(QVariantList fixtureIDs)
diff --git a/qmlui/fixturemanager.h b/qmlui/fixturemanager.h
index 6d31865269..8944afe772 100644
--- a/qmlui/fixturemanager.h
+++ b/qmlui/fixturemanager.h
@@ -324,12 +324,14 @@ public slots:
 public:
     /** Returns a list of fixture names for representation in a GridEditor QML component */
     QVariantList fixtureNamesMap();
+    void setFixtureNamesMap(QVariantList fixtureNamesMap);
 
     /** Get a string to be displayed as tooltip for a fixture at $address */
     Q_INVOKABLE QString getTooltip(quint32 address);
 
     /** Returns data for representation in a GridEditor QML component */
     QVariantList fixturesMap();
+    void setFixturesMap(QVariantList fixturesMap);
 
     Q_INVOKABLE int pasteFromClipboard(QVariantList fixtureIDs);
 
diff --git a/qmlui/main.cpp b/qmlui/main.cpp
index 391cf6c78e..2700ba0927 100644
--- a/qmlui/main.cpp
+++ b/qmlui/main.cpp
@@ -62,6 +62,11 @@ void printVersion()
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+// Since Qt6, the default rendering backend is Rhi. QLC doesn't support it yet so OpenGL have to be forced.
+    QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGLRhi);
+    qputenv("QT3D_RENDERER", "opengl");
+#endif
 
     QApplication::setOrganizationName("qlcplus");
     QApplication::setOrganizationDomain("org");
diff --git a/qmlui/qml/ActionsMenu.qml b/qmlui/qml/ActionsMenu.qml
index 713a28fabb..7c1251242b 100644
--- a/qmlui/qml/ActionsMenu.qml
+++ b/qmlui/qml/ActionsMenu.qml
@@ -109,6 +109,7 @@ Popup
     CustomPopupDialog
     {
         id: saveFirstPopup
+        width: menuRoot.width  // Set width to avoid binding loops on implicit sizes
         title: qsTr("Your project has changes")
         message: qsTr("Do you wish to save the current project first?\nChanges will be lost if you don't save them.")
         standardButtons: Dialog.Yes | Dialog.No | Dialog.Cancel
@@ -581,6 +582,7 @@ Popup
             PopupAbout
             {
                 id: infoPopup
+                width: menuRoot.width	// Set width to avoid binding loops on implicit sizes
             }
         }
     }
diff --git a/qmlui/qml/CustomComboBox.qml b/qmlui/qml/CustomComboBox.qml
index 691790c6e3..3162052b36 100644
--- a/qmlui/qml/CustomComboBox.qml
+++ b/qmlui/qml/CustomComboBox.qml
@@ -113,7 +113,7 @@ ComboBox
     delegate:
         ItemDelegate
         {
-            width: parent.width
+            width: parent?.width
             implicitHeight: delegateHeight
             highlighted: control.highlightedIndex === index
             hoverEnabled: control.hoverEnabled
diff --git a/qmlui/qml/GenericButton.qml b/qmlui/qml/GenericButton.qml
index 7a62f5db08..b1fc6bf52e 100644
--- a/qmlui/qml/GenericButton.qml
+++ b/qmlui/qml/GenericButton.qml
@@ -94,7 +94,7 @@ Rectangle
         anchors.fill: parent
         hoverEnabled: true
         acceptedButtons: Qt.LeftButton | Qt.RightButton
-        onClicked: btnRoot.clicked(mouse.button)
+        onClicked: (mouse) => btnRoot.clicked(mouse.button)
         onPressAndHold:
         {
             if (repetition == true)
diff --git a/qmlui/qml/fixtureeditor/FixtureEditor.qml b/qmlui/qml/fixtureeditor/FixtureEditor.qml
index 8775cb1c32..485a3a4240 100644
--- a/qmlui/qml/fixtureeditor/FixtureEditor.qml
+++ b/qmlui/qml/fixtureeditor/FixtureEditor.qml
@@ -49,7 +49,8 @@ Rectangle
         id: openDialog
         visible: false
         title: qsTr("Open a fixture definition")
-        currentFolder: "file://" + fixtureEditor.workingPath
+        // fixtureEditor may be null on exit
+        currentFolder: "file://" + fixtureEditor?.workingPath
         nameFilters: [ qsTr("Fixture definition files") + " (*.qxf)", qsTr("All files") + " (*)" ]
 
         onAccepted:
@@ -70,7 +71,8 @@ Rectangle
         id: saveDialog
         visible: false
         title: qsTr("Save definition as...")
-        currentFolder: "file://" + fixtureEditor.workingPath
+        // fixtureEditor may be null on exit
+        currentFolder: "file://" + fixtureEditor?.workingPath
         fileMode: FileDialog.SaveFile
         nameFilters: [ qsTr("Fixture definition files") + " (*.qxf)", qsTr("All files") + " (*)" ]
         defaultSuffix: "qxf"
@@ -266,7 +268,7 @@ Rectangle
                 id: editorsRepeater
                 model: fixtureEditor ? fixtureEditor.editorsList : null
 
-                onItemAdded: item.clicked()
+                onItemAdded: (index,item) => item.clicked()
 
                 delegate:
                     MenuBarEntry
diff --git a/qmlui/qml/fixturesfunctions/2DView.qml b/qmlui/qml/fixturesfunctions/2DView.qml
index 6c9ec0ca06..0230eb6553 100644
--- a/qmlui/qml/fixturesfunctions/2DView.qml
+++ b/qmlui/qml/fixturesfunctions/2DView.qml
@@ -222,7 +222,7 @@ Rectangle
                 property int initialXPos
                 property int initialYPos
 
-                onPressed:
+                onPressed: (mouse) =>
                 {
                     console.log("button: " + mouse.button + ", mods: " + mouse.modifiers)
                     var itemID = View2D.itemIDAtPos(Qt.point(mouse.x, mouse.y))
@@ -256,7 +256,7 @@ Rectangle
                     }
                 }
 
-                onPositionChanged:
+                onPositionChanged: (mouse) =>
                 {
                     if (selectionRect.visible == true)
                     {
@@ -294,7 +294,7 @@ Rectangle
                     }
                 }
 
-                onReleased:
+                onReleased: (mouse) =>
                 {
                     if (selectionRect.visible === true && selectionRect.width && selectionRect.height)
                     {
@@ -317,7 +317,7 @@ Rectangle
                     }
                 }
 
-                onWheel:
+                onWheel: (wheel)=>
                 {
                     //console.log("Wheel delta: " + wheel.angleDelta.y)
                     if (wheel.angleDelta.y > 0)
diff --git a/qmlui/qml/fixturesfunctions/3DView/3DView.qml b/qmlui/qml/fixturesfunctions/3DView/3DView.qml
index 19e2aef0f9..d236c366e5 100644
--- a/qmlui/qml/fixturesfunctions/3DView/3DView.qml
+++ b/qmlui/qml/fixturesfunctions/3DView/3DView.qml
@@ -330,7 +330,7 @@ Rectangle
 
                 projectionType: CameraLens.PerspectiveProjection
                 fieldOfView: 45
-                aspectRatio: viewSize.width / viewSize.height
+                aspectRatio: viewCamera.width / viewCamera.height
                 nearPlane: 1.0
                 farPlane: 1000.0
                 position: View3D.cameraPosition
@@ -360,7 +360,7 @@ Rectangle
                 property int selGenericCount: View3D.genericSelectedCount
 
                 sourceDevice: mDevice
-                onPressed:
+                onPressed: (mouse) =>
                 {
                     directionCounter = 0
                     dx = 0
@@ -368,7 +368,7 @@ Rectangle
                     startPoint = Qt.point(mouse.x, mouse.y)
                 }
 
-                onPositionChanged:
+                onPositionChanged: (mouse) =>
                 {
                     if (directionCounter < 3)
                     {
@@ -444,7 +444,7 @@ Rectangle
                         if (!mouse.modifiers || (mouse.modifiers & Qt.ShiftModifier && direction == Qt.Horizontal))
                             viewCamera.panAboutViewCenter(-xDelta, Qt.vector3d(0, 1, 0))
                         if (!mouse.modifiers || (mouse.modifiers & Qt.ShiftModifier && direction == Qt.Vertical))
-                            viewCamera.tiltAboutViewCenter(yDelta, Qt.vector3d(1, 0, 0))
+                            viewCamera.tiltAboutViewCenter(yDelta)
 
                         View3D.cameraPosition = viewCamera.position
                         View3D.cameraUpVector = viewCamera.upVector
@@ -464,7 +464,7 @@ Rectangle
                     startPoint = Qt.point(mouse.x, mouse.y)
                 }
 
-                onWheel:
+                onWheel: (wheel) =>
                 {
                     if (wheel.angleDelta.y > 0)
                         viewCamera.setZoom(-1)
diff --git a/qmlui/qml/fixturesfunctions/3DView/Fixture3DItem.qml b/qmlui/qml/fixturesfunctions/3DView/Fixture3DItem.qml
index 1ec83f1294..6feac50215 100644
--- a/qmlui/qml/fixturesfunctions/3DView/Fixture3DItem.qml
+++ b/qmlui/qml/fixturesfunctions/3DView/Fixture3DItem.qml
@@ -232,14 +232,14 @@ Entity
     {
         id: panAnim
         running: false
-        easing.type: Easing.Linear
+        easing.type: QQ2.Easing.Linear
     }
 
     QQ2.NumberAnimation on tiltRotation
     {
         id: tiltAnim
         running: false
-        easing.type: Easing.Linear
+        easing.type: QQ2.Easing.Linear
     }
 
     property Texture2D depthTex:
@@ -292,7 +292,7 @@ Entity
         id: goboAnim
         running: false
         duration: 0
-        easing.type: Easing.Linear
+        easing.type: QQ2.Easing.Linear
         from: 0
         to: 360
         loops: QQ2.Animation.Infinite
@@ -323,7 +323,7 @@ Entity
     {
         id: eSceneLoader
 
-        onStatusChanged:
+        onStatusChanged: (status) =>
         {
             if (status === SceneLoader.Ready)
                 View3D.initializeFixture(itemID, fixtureEntity, eSceneLoader)
diff --git a/qmlui/qml/fixturesfunctions/3DView/SelectionGeometry.qml b/qmlui/qml/fixturesfunctions/3DView/SelectionGeometry.qml
index f0071f5406..32d32264fe 100644
--- a/qmlui/qml/fixturesfunctions/3DView/SelectionGeometry.qml
+++ b/qmlui/qml/fixturesfunctions/3DView/SelectionGeometry.qml
@@ -70,14 +70,12 @@ GeometryRenderer
     Buffer
     {
         id: vertexBuffer
-        type: Buffer.VertexBuffer
         data: vertexBufferData()
     }
 
     Buffer
     {
         id: indexBuffer
-        type: Buffer.IndexBuffer
         data: indexBufferData()
     }
 
diff --git a/qmlui/qml/fixturesfunctions/3DView/StageBox.qml b/qmlui/qml/fixturesfunctions/3DView/StageBox.qml
index c567f52b27..f1af18533c 100644
--- a/qmlui/qml/fixturesfunctions/3DView/StageBox.qml
+++ b/qmlui/qml/fixturesfunctions/3DView/StageBox.qml
@@ -37,8 +37,8 @@ Entity
             effect: stage.effect
 
             parameters: [
-                Parameter { name: "diffuse"; value: "lightgray" },
-                Parameter { name: "specular"; value: "black" },
+                Parameter { name: "diffuse"; value: Qt.color("lightgray") },
+                Parameter { name: "specular"; value: Qt.color("black") },
                 Parameter { name: "shininess"; value: 1.0 },
                 Parameter { name: "bloom"; value: 0 }
             ]
@@ -76,7 +76,7 @@ Entity
         ObjectPicker
         {
             id: groundPicker
-            onClicked: contextManager.setPositionPickPoint(pick.worldIntersection)
+            onClicked: (pick) => contextManager.setPositionPickPoint(pick.worldIntersection)
         }
 
         components: [
@@ -98,7 +98,7 @@ Entity
         ObjectPicker
         {
             id: leftPicker
-            onClicked: contextManager.setPositionPickPoint(pick.worldIntersection)
+            onClicked: (pick) => contextManager.setPositionPickPoint(pick.worldIntersection)
         }
 
         components: [
@@ -119,7 +119,7 @@ Entity
         ObjectPicker
         {
             id: rightPicker
-            onClicked: contextManager.setPositionPickPoint(pick.worldIntersection)
+            onClicked: (pick) => contextManager.setPositionPickPoint(pick.worldIntersection)
         }
 
         components: [
@@ -140,7 +140,7 @@ Entity
         ObjectPicker
         {
             id: backPicker
-            onClicked: contextManager.setPositionPickPoint(pick.worldIntersection)
+            onClicked: (pick) => contextManager.setPositionPickPoint(pick.worldIntersection)
         }
 
         components: [
diff --git a/qmlui/qml/fixturesfunctions/3DView/StageRock.qml b/qmlui/qml/fixturesfunctions/3DView/StageRock.qml
index ba8a6d3d1b..75d100ceac 100644
--- a/qmlui/qml/fixturesfunctions/3DView/StageRock.qml
+++ b/qmlui/qml/fixturesfunctions/3DView/StageRock.qml
@@ -42,8 +42,8 @@ Entity
             effect: stage.effect
 
             parameters: [
-                Parameter { name: "diffuse"; value: "lightgray" },
-                Parameter { name: "specular"; value: "black" },
+                Parameter { name: "diffuse"; value: Qt.color("lightgray") },
+                Parameter { name: "specular"; value: Qt.color("black") },
                 Parameter { name: "shininess"; value: 1.0 },
                 Parameter { name: "bloom"; value: 0 }
             ]
@@ -203,7 +203,7 @@ Entity
         ObjectPicker
         {
             id: stagePicker
-            onClicked: contextManager.setPositionPickPoint(pick.worldIntersection)
+            onClicked: (pick) => contextManager.setPositionPickPoint(pick.worldIntersection)
         }
 
         components: [
diff --git a/qmlui/qml/fixturesfunctions/3DView/StageSimple.qml b/qmlui/qml/fixturesfunctions/3DView/StageSimple.qml
index 4d95b451f0..23ae5e46bb 100644
--- a/qmlui/qml/fixturesfunctions/3DView/StageSimple.qml
+++ b/qmlui/qml/fixturesfunctions/3DView/StageSimple.qml
@@ -35,8 +35,8 @@ Entity
         {
             effect: stage.effect
             parameters: [
-                Parameter { name: "diffuse"; value: "lightgray" },
-                Parameter { name: "specular"; value: "black" },
+                Parameter { name: "diffuse"; value: Qt.color("lightgray") },
+                Parameter { name: "specular"; value: Qt.color("black") },
                 Parameter { name: "shininess"; value: 1.0 },
                 Parameter { name: "bloom"; value: 0 }
             ]
@@ -56,7 +56,7 @@ Entity
     ObjectPicker
     {
         id: stagePicker
-        onClicked: contextManager.setPositionPickPoint(pick.worldIntersection)
+        onClicked: (pick) => contextManager.setPositionPickPoint(pick.worldIntersection)
     }
 
     components: [
diff --git a/qmlui/qml/fixturesfunctions/3DView/StageTheatre.qml b/qmlui/qml/fixturesfunctions/3DView/StageTheatre.qml
index 5928940ffe..a2a2fd140a 100644
--- a/qmlui/qml/fixturesfunctions/3DView/StageTheatre.qml
+++ b/qmlui/qml/fixturesfunctions/3DView/StageTheatre.qml
@@ -45,8 +45,8 @@ Entity
         {
             effect: stage.effect
             parameters: [
-                Parameter { name: "diffuse"; value: "lightgray" },
-                Parameter { name: "specular"; value: "black" },
+                Parameter { name: "diffuse"; value: Qt.color("lightgray") },
+                Parameter { name: "specular"; value: Qt.color("black") },
                 Parameter { name: "shininess"; value: 1.0 },
                 Parameter { name: "bloom"; value: 0 }
             ]
@@ -167,7 +167,7 @@ Entity
         ObjectPicker
         {
             id: stagePicker
-            onClicked: contextManager.setPositionPickPoint(pick.worldIntersection)
+            onClicked: (pick) => contextManager.setPositionPickPoint(pick.worldIntersection)
         }
 
         components: [
diff --git a/qmlui/qml/fixturesfunctions/FixtureBrowser.qml b/qmlui/qml/fixturesfunctions/FixtureBrowser.qml
index e61af10d84..fff4bddad1 100644
--- a/qmlui/qml/fixturesfunctions/FixtureBrowser.qml
+++ b/qmlui/qml/fixturesfunctions/FixtureBrowser.qml
@@ -132,7 +132,7 @@ Rectangle
                 width: modelsList.width - (manufScroll.visible ? manufScroll.width : 0)
                 isManufacturer: true
                 textLabel: modelData
-                onMouseEvent:
+                onMouseEvent: (type, iID, iType, qItem, mouseMods) =>
                 {
                     if (type == App.Clicked)
                     {
@@ -239,7 +239,7 @@ Rectangle
                     manufacturer: fixtureBrowser.selectedManufacturer
                     textLabel: modelData
 
-                    onMouseEvent:
+                    onMouseEvent: (type, iID, iType, qItem, mouseMods) =>
                     {
                         if (type == App.Clicked)
                         {
diff --git a/qmlui/qml/fixturesfunctions/FixtureBrowserDelegate.qml b/qmlui/qml/fixturesfunctions/FixtureBrowserDelegate.qml
index 65cb03d18e..b8a320481a 100644
--- a/qmlui/qml/fixturesfunctions/FixtureBrowserDelegate.qml
+++ b/qmlui/qml/fixturesfunctions/FixtureBrowserDelegate.qml
@@ -111,11 +111,11 @@ Item
         id: fxMouseArea
         anchors.fill: parent
         hoverEnabled: true
-        onClicked: fxDraggableItem.mouseEvent(App.Clicked, 0, 0, fxDraggableItem, mouse.modifiers)
+        onClicked: (mouse) => fxDraggableItem.mouseEvent(App.Clicked, 0, 0, fxDraggableItem, mouse.modifiers)
         drag.target: FixtureDragItem { }
         drag.threshold: 30
 
-        onPressed:
+        onPressed: (mouse) =>
         {
             if (fxDraggableItem.isManufacturer == false)
             {
@@ -124,11 +124,15 @@ Item
                 FxDragJS.initProperties()
             }
         }
-        onPositionChanged:
+        onPositionChanged: (mouse) =>
+        {
             if (fxDraggableItem.isManufacturer == false && drag.active == true)
                 FxDragJS.handleDrag(mouse)
-        onReleased:
+        }
+        onReleased: (mouse) =>
+        {
             if (fxDraggableItem.isManufacturer == false && drag.active == true)
                 FxDragJS.endDrag(mouse)
+        }
     }
 }
diff --git a/qmlui/qml/fixturesfunctions/FixturesAndFunctions.qml b/qmlui/qml/fixturesfunctions/FixturesAndFunctions.qml
index 2c697d81fd..37d7bafb03 100644
--- a/qmlui/qml/fixturesfunctions/FixturesAndFunctions.qml
+++ b/qmlui/qml/fixturesfunctions/FixturesAndFunctions.qml
@@ -213,7 +213,7 @@ Rectangle
                     height: viewToolbar.height - 4
                     anchors.margins: 1
                     model: ioManager.universesListModel
-                    currValue: contextManager.universeFilter
+                    currValue: contextManager?.universeFilter
 
                     onValueChanged:
                     {
diff --git a/qmlui/qml/fixturesfunctions/LeftPanel.qml b/qmlui/qml/fixturesfunctions/LeftPanel.qml
index 19d9f1382a..2b571411e3 100644
--- a/qmlui/qml/fixturesfunctions/LeftPanel.qml
+++ b/qmlui/qml/fixturesfunctions/LeftPanel.qml
@@ -31,7 +31,7 @@ SidePanel
     anchors.leftMargin: 0
     panelAlignment: Qt.AlignLeft
 
-    onContentLoaded:
+    onContentLoaded: (item, ID) =>
     {
         item.width = Qt.binding(function() { return leftSidePanel.width - collapseWidth })
         item.height = Qt.binding(function() { return leftSidePanel.height })
@@ -339,7 +339,7 @@ SidePanel
                 height: iconSize
                 faSource: FontAwesome.fa_bolt
                 tooltip: qsTr("Highlight")
-                counter: contextManager.selectedFixturesCount
+                counter: contextManager?.selectedFixturesCount
                 onClicked: contextManager.highlightFixtureSelection()
             }
 
diff --git a/qmlui/qml/fixturesfunctions/PaletteManager.qml b/qmlui/qml/fixturesfunctions/PaletteManager.qml
index bd16502a8c..24ea94ebe5 100644
--- a/qmlui/qml/fixturesfunctions/PaletteManager.qml
+++ b/qmlui/qml/fixturesfunctions/PaletteManager.qml
@@ -224,7 +224,7 @@ Rectangle
                       drag.target: pDragItem
                       drag.threshold: height / 2
 
-                      onPressed:
+                      onPressed: (mouse) =>
                       {
                           if (model.isSelected)
                               return
diff --git a/qmlui/qml/fixturesfunctions/UniverseGridView.qml b/qmlui/qml/fixturesfunctions/UniverseGridView.qml
index c1ea8bf4cc..0a57a60afc 100644
--- a/qmlui/qml/fixturesfunctions/UniverseGridView.qml
+++ b/qmlui/qml/fixturesfunctions/UniverseGridView.qml
@@ -19,6 +19,7 @@
 
 import QtQuick
 import QtQuick.Layouts
+import QtQuick.Controls
 
 import "."