I am having a weird issue when using the video output in Motion 3.0.2. On a dual-dual core 3Ghz with BlackMagic Extreme HD card on a 720p30 (square pixel) project using any and all RGB video output selections.
The issue is that when looking at it on my client monitor and reference monitor it is showing me more than the actual canvas. and won't grow to the full frame. I see additional area around everything i make, like it is showing me the outside areas of my working canvas.
Yeah I would check your render output options like Peter suggested. Make sure they are set to the same dimensions that your project is set to. That would be my first inclination. Also maybe try to render out using Apple Pro Res 422 if that doesn't work. I've had similar issues using BlackMagic.