Vive Mocap Kit - Support

Hi @ ,
I followed steps by steps the tutorial your made, “Vive Mocap: body tracking setup” , but somehow the Vive trackers can not be tracked ( trackers mesh don’t move, just sit on the ground) , only the main controllers and headset work. But the demo project you provide could work perfectly,all trackers could be seen and tracked. So is there extra steps I should do for the latest plugin?