I watched the tutorial on how to make a chain using the Create Animation Snapshot and it worked great. Had to play with the Increment to get the spacing correct. Now when I try to animate the track I select the first tread and the nurb circle and attach to motion path. The tread disappears, when I hit the play button to see if there is a animation the tread appears in the background and moves around like a fly buzzing all over the place. Any suggestions on how I can now animate the treads.