I use the RGB setting on SkyDigital as it gives a far superior picture colour and sharpness than the regular setting. I use a good Scart for this but, on small items on the screen in RED there is a clear blockiness to it. this does not affect the on-screen graphics but just those red areas on the actual TV show/film instead. When i switch back to normal scart setting this problem is gone. any ideas what the problem is?