https://bugs.kde.org/show_bug.cgi?id=428632
--- Comment #2 from d.pische...@gmail.com --- I'm still waiting any reaction from kde team. But I've debug kdenlive and found: QQuickWindowPrivate::init() creates context: qquickwindow.cpp code: context = windowManager->createRenderContext(sg); and connects it to sceneGraphInitialized directly: qquickwindow.cpp code: QObject::connect(context, SIGNAL(initialized()), q, SIGNAL(sceneGraphInitialized()), Qt::DirectConnection); which has direct connection to GLWidget::reconfigure But later QSGDefaultRenderContext::initialize is called from QSRenderThread, which calls initialized signal in the thread. => we have QObject::setProperty call from another thread -> assert. glwidget.cpp code: setProperty("mlt_service", serviceName); I suggest to replace connections to Queued or add some "proxy objects" between for avoid inter-thread calls. ping support team. -- You are receiving this mail because: You are watching all bug changes.