to avoid any confusion – i am telling about 2 different issues, both resulting from updating to the latest daily builds.
1) The code posted above, worked with the latest stable build, but fails with daily. However, after setting the x property manually its working now also with daily builds.
2) It seems that the Clipping Element is causing a rendering error now, when it is containing png images with “soft” edges (i.e. image shape fades out with a gradient). In this case the images will be rendered with an ugly black border. Also setting Flickable.clip: true, results in the same effect.