How long did the second player wait until deciding that the light weren't coming on ? On the larger cells it can take a bit of time to light them all up, especially when flying in as the player is lighting cells up more quickly..
only a minute or 2, but this is because i told him to. i have run around for 5mins or so but still no lights. funny thing is if i return to a place i took off from in a heli where the lights where working, they are still on!