I have 3840 x 2160 footage. When I import into Final Cut Pro 7 it staggers on the timeline. I then encoded the footage with Apple pro Res using same 3840 x 2160 size. This still staggered on the timeline. Is it because FCP 7 is not set up for 4K resolution size? When I reduce the size to HD 1920 x 1080 a strobing /staggering lines start to appear on footage such as building windows ? This must be the data crushed so much it starts to flicker ? Should I offline edit in HD and then when that is finished do a 4K duplicate and export that? My interest is when I'm ready to deliver the final edit, what codec will give best quality without the strobing on whites and lines.