So I made the version 1 that creates a hanging rope, which work fine.
CassetteVaulter.gh (10.2 KB)
I used the same model, just changed the starting curve, and it stopped working.
Vaulter_V2.gh (12.8 KB)
Could anyone explain me why this happens 
Hi -
The Shatter component takes parameter locations of a curve as the input, not points.
In your first example, the curve started at 0,0 and the domain of the curve was the same as its length. In that condition, and in this example, using points as input works. But that’s just luck. You’ll need to find the parameter locations of the points on the curve and use these as input.
-wim