Since pmpd and msd are deprecated, I'm trying to build a simple 2D spring mass model using 6dof. Moving an object around, and having a second object following the first but with mass-spring behaviour. Unfortunately, everytime I open the phys.6dof.spring example, it works for about 4 seconds, then the tore and sphere disapears. When i try a getposition on one of the jit.phys.body i get "position nan nan nan" from the right outlet.

I get the same kind of magic disapearing with mat mat's spring patch. (from this topic : https://cycling74.com/forums/spring-behavior-in-jit-phys). If i dont touch anything, it works like a charm, but if I click on the impulse message, 4 seconds later, everything is gone.

The other phys examples work fine (even the 6dof help patch). OSX 10.9.5 Max 7.3.5

Any idea ?