Hi Kevin,
Rui had the same problem sometime back and I replayed back from the top of the stairs going down. Use steps #1, 3, 6, 7, 9, 10. When you start just count off from the top of the steps to #3 and click on it. Then your view will be from the side of the steps where you can look back up to the top and down to the bottom. Count off the steps to #6 - ignore where you are just click on the 6th step and so on and so forth til the bottom and a click will be heard. The placement of where you are while going down can confuse you, where you think you are is not excatly where the step you previously clicked on - so ignore it and just count from top to bottom, OK.
I'll see if I can place a better picture on board - haven't done in a while -

Hope this helps!
MaG