just to try and help - one thing that it could be is if your telly has all of its scart lead on the rear all next to each other which normally is the case - and in most cases people tend to use any old scart lead - invest in some good ones with metal cases round the plug itself - reason being is that one scart will "radiate" into the next causing ghosting - i had the same problem and bought some IXOS cables and then the problem was gone and the picture was improved at the same time......thats what did for me anyway pardon the pun....
if you also have a vcr plugged to the tv it will be a frequeny clash between the two, to check turn the video off and see if it dissapears, if so you can change the frequency in the settings