If I wish to use track motion to place 4 identically sized, PAL (720 x 576) video clips at once into a project. I tried placing the first clip for the top left hand corner so that the bottom right of the clip was at the center, & then tried to reduce the clip down to 1/4 size. As soon as I clicked on the corner to drag it the corner moved away from the center. What is the correct way to do this?