I am running my MacMini 1.83GHz, OSX10.6.3 through my 37" Sharp LCD TV as my media centre. When I activate the iTunes visualiser in full screen, the image jumps and jagged lines appear randomly across the screen. This does not happen if the visualiser Is running where you can see iTunes control bar above and below the visualiser graphics. It also does not seem to happen with any of the other iTunes built in visualisers. Can anyone offer any suggestions as to why this is happening? Thanks in advance.