I just changed my set-up from two 19 inch and two 17 inch to three 19 inch and one 17 inch. The three 19 in are on a desk next to eachother and the 17 inch sits above the center 19 inch. (I just changed the left monitor from a 17 to a 19 inch). Now when I apply changes to the Display Properties in the Windows Control panel it changes the arrangement of the monitors from three across, one on top, to 4 across. The only way I can get it to arrange in the correct way is to change the resolution of the top screen so that I don't get use of the full area of the top screen. Can someone give me some advice on how to fix this? Many thanks.