Copy position from one rope to another

[lufydad]

Not really, never have seen similar behavior. Looks close to what happens when the solver's sleep threshold is too high (particles move in a stop-motion fashion) but not quite the same.

Is the code you originally posted the same you're currently using to copy data from one solver to the other?

For the sleep threshold I use what you suggest in this post, therefore I don't think it's related. And yes I use the same code that the one in first question.