the crash is happening when doing this comand: RenderManager.getViewportRegion(). No problem with the getViewer() and getSoRenderManager().does getViewer() return a valid object? and returns getSoRenderManager a valid object?
I tried both (with coin imported and withoout) but always get the crash afer doing the getViewportRegion() command and moving the mouse over the scene.SoQt is not needed anymore, you will need to import coin, but I suppose that you did so already?
I haven't got it anymore. I will try to reproduce on another machine and post here.What was your exact Python code to get the viewport with the old soqt stuff