SPOILERS!!!
Just did a Exile hack on an AI world, then got the journal entry saying that something nearby was intercepting some kind of signal. (or something to that effect) It tells me to capture the planet I just hacked. Ok, done. Nothing happens. I recheck Exile on the galaxy map, and it only shows the starting info still. Oh well, must not have been close enough then. So a bit later I go to hack another world, and it wont hack at all. Did I miss a step?