When I say all other ropes stop working, it seems that they only stop updating visually. Their bounds and other things are still working and moving correctly, its just visually they stop. If any ropes are added after this, or if the bugged rope is clicked in the inspector, it starts rendering correctly again.
Edit: Using the particle grid debugger, its definitely just the mesh that isn't updating, the particles are all correct.
Edit: Using the particle grid debugger, its definitely just the mesh that isn't updating, the particles are all correct.