I've just opened Motion 3 on my new MacBook Pro for the first time and upon selecting the DVCPRO HD 720p24 preset it's loading up a 4:3 square canvas. Motion Project properties tells me the pixel aspect ratio is 1.33. I'm confused because it seems with these very same settings on another system I'm not having any problems. Could someone please shed some light on this issue and help me troubleshoot? THanks so much.