About the issue where your game is showing as having deleted DLC's or lost game totally. Go to your Steam app. Go to Steam < Settings < Downloads < Clear Download Cache. This should restart Steam and you should have access to your game & DLCs.
So, would it have been too powerful to have Tier 3 block all Vaults for 60 seconds when the last Gen was completed? That would have made this perk good as this perk is extremely map reliant and unusable on most maps.