I have been trying to render my Video mixes for almost a week now with a constant problem, everytime as I try to Export with a 16:9 aspect ratio, the first video in my mix comes out as a 4:3 then the rest of the mix is perfect as a 16:9....i still havent figured out what triggers the change as it exports......please assist me as soon as you can....i'm going bonkers rendering dozens of mixes with the same problem.