recently done the same, ugraged to scart from the coax arile type connection.
i have set my box to widescreen now, instead of letterbox as it was before, this meant the box will tell thew tv when a widescreen signal is being sent via scart and the tv will adjust to widescreen format automatically.
is you dont want this to happen, select letterbox to give a letterbox output fomr the box, or select 4:3 which will give a normal 4:3 picture but will cut off the sides from widescreen program (like farscape)
sorry this seems abit rushed and others will be able to explain it better, but im quite busy at the moment.
ps. so was that the end of farscape then? they were on the boat and they ***********

(you know what happnes dont want to spoil it for others)