The mission I'm talking about is Oldest Profession
from the Gallente epic mission arc.
I have killed every ship in the room, popped every structure, looted all Spintric Coins (seven of them) and the Spintrixiate Rewards Coin. But trying to activate the gate that spawned after I destroyed The Spintrix I am prompted with the following.
This gate is locked! There are synchronized gate scramblers on all hostile entities in this deadspace pocket. Unless you are physically inside one of them to unscramble the signal, you must simply clear the vicinity of enemy ships. So grab your guns.
Out of things to shoot, I missed something? Or is it another case of CCP derping?