QML GUI is no longer working on Windows

[JoergAtGithub]

Bug Description

I get the followin error and the UI does not come up anymore:

warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/DeckRow.qml:47:13: QML PropertyChanges: Cannot assign to non-existent property "visible"
warning [Main] qrc:/qt-project.org/imports/Qt5Compat/GraphicalEffects/GaussianBlur.qml:258: TypeError: Property '_rebuildShaders' of object [null] is not a function
warning [Main] qrc:/qt-project.org/imports/Qt5Compat/GraphicalEffects/GaussianBlur.qml:258: TypeError: Property '_rebuildShaders' of object [null] is not a function
warning [Main] qrc:/qt-project.org/imports/Qt5Compat/GraphicalEffects/GaussianBlur.qml:258: TypeError: Property '_rebuildShaders' of object [null] is not a function
warning [Main] qrc:/qt-project.org/imports/Qt5Compat/GraphicalEffects/GaussianBlur.qml:258: TypeError: Property '_rebuildShaders' of object [null] is not a function
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/DeckRow.qml:59: TypeError: Cannot read property 'left' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/DeckRow.qml:54: TypeError: Cannot read property 'height' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/ComboBox.qml:41: TypeError: Cannot read property 'width' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/DeckRow.qml:11: TypeError: Cannot read property 'height' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/DeckInfoBar.qml:209: TypeError: Cannot read property 'color' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/DeckInfoBar.qml:29: TypeError: Cannot read property 'coverArtUrl' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/DeckInfoBar.qml:98: TypeError: Cannot read property 'title' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/DeckInfoBar.qml:122: TypeError: Cannot read property 'artist' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/DeckInfoBar.qml:147: TypeError: Cannot read property 'keyText' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/Deck.qml:20: TypeError: Cannot read property 'trackLocationUrl' of null
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/EqColumn.qml:32: TypeError: Cannot read property 'stemsModel' of null
warning [Main] QQmlApplicationEngine failed to create component
warning [Main] file:///D:/mixxx-main-pr-test/install/x64__portable/qml/QuickFxKnob.qml:70:9: Cannot set properties on indicator as it is null
critical [Main] Failed to load QML file "D:/mixxx-main-pr-test/install/x64__portable/qml/main.qml"

Version

main

OS

Windows 11