arbiter does not score after a reset

I flew the drones into the cube and watched endurance score appear. It seems that it only accrues when there are active drones.

However when I reset the arbiter it did not start accumulating endurance points: https://youtu.be/ISesLEruS0g?t=7m18s most of the vehicles were in orbit and active in their field. Like this: http://i.imgur.com/oeirkV8.png