Problems creating multiple joints dynamically after version 1.8.0

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Hi,

I have this piece of code to create joints between spheres dynamically, it worked on version 1.8.0 but after installing 1.8.2 / 1.8.4 when I create the joints between more than 5 spheres, it gives no error, but the the model explodes.

Here is the code:

void DynamicJointPlugin::createJoint(physics::LinkPtr _center_link, physics::LinkPtr _ext_link)
{
    math::Vector3 axis,direction;

    // compute the axis
    direction = _ext_link->GetWorldPose().pos - _center_link->GetWorldPose().pos;
    direction.Normalize();
    axis = direction.Cross(math::Vector3(0.0, 0.0, 1.0));

    this->myJoints.push_back(this->liquid_model->GetWorld()->GetPhysicsEngine()->CreateJoint("revolute", this->liquid_model));

    this->myJoints.back()->Attach(_ext_link, _center_link );

    this->myJoints.back()->Load(_ext_link, _center_link , math::Pose(_center_link->GetWorldPose().pos, math::Quaternion()));

    this->myJoints.back()->SetAxis(0, axis);

    this->myJoints.back()->SetAttribute("stop_cfm",0, this->stop_cfm);
    this->myJoints.back()->SetAttribute("stop_erp",0, this->stop_erp);
    this->myJoints.back()->SetAttribute("hi_stop",0, this->limit_stop);
    this->myJoints.back()->SetAttribute("lo_stop",0, - this->limit_stop);
}

What changes should I make so it will work again?

Cheers, Andrei