I have the same problem. I’m using vegas pro 13. i’ve seen tutorials and when the person is in the track motion window and they move the timeline slider to add a new positions, then move, rotate, scale the object, it all shows in real time in the preview screen. but when i try it it doesn’t happen, i can create new positions and manipulate the object, but to see what i’ve done i have to close the track motion windows and hit play in the preview screen. this is incredibly inpractical and it’s making things exponentially longer since i have to animate some 10 objects all in different tracks. any thoughts?