Thank you, Alex. Alright, here comes the crime scene...
First updated to the latest Oculus Rift SDK 1.41.0. The scene rendered in VR 90 degrees to the right with interaction box and stable hands. Then updated to Leap Motion SDK 4.0.0, the scene rendered again 90 degrees to the right but this time with no interaction box and unstable hands. For some reason, the Leap Motion interaction box is not rendered anymore or probably rendered somewhere where I can not see it!
On another note, still only one hand shows in the Oculus Rift split-screen. Please, see this other post before SDK's updates where the scene is rendered in front using a DK2 with 2 interaction boxes, one to the left and one to the right, but only one hand to the left: https://forums.leapmotion.com/t/hand-in-left-split-screen-only/8300.
Just to confirm, when you say "make sure the VR tracking mode flag is enabled", you mean setting the controller policy, right, as in: m_controller.setPolicy(static_cast(Leap::Controller::POLICY_OPTIMIZE_HMD | Leap::Controller::POLICY_IMAGES));
The code has not been changed at all. Any idea what is going on, please?