When watching SD programmes I sometimes get a frozen snapshot image overlaid with the correct moving image. It stays typically for a few seconds before clearing. It most often happens during a zoom, or with scrolling titles. When viewing a Sky+ recording, the effect is there on the recording even in slow-motion. I don't know if this is "smearing" or some other effect... but I don't like it! I don't get it on HD, nor on terrestrial digital, nor DVD. Just when using the Sky HD receiver for viewing SD. Anyone know what it is and how to make it go away?