ObiRope Collision Penetration

[Raymond]

The problem above Has been solved by change the distance constraint of the rope, but there's another problem ,when I save the gameobject made of ropes to be a prefab ,it isn't the same with what I twined before ,In 4.1,I can set the active of the gameobject false then true to trigger the dirty flag, and save what I want successfully, but it dose's work in 6.4