I checked to see if anyone's mentioned this, but I can't find whether or not anyone else is having this problem.
I have Fallout 4 on Steam and I've had no problems at all, and I was counting my lucky stars.
I counted too early, however.
The Quest "When Freedom Rings" is fine up until you must clear Concord of all the hostiles. I cleared the hostiles, including Deathclaw. A little notification for quest completion popped up on the side, only the quest does not complete. It says I still need to clear the hostiles, and after searching high and low (including the little area underneath Concord) I have found 0 hostiles.
As a completionist with a stupidly insane need to complete everything in as linear a fashion as I can in such an open world... this is driving me absolutely insane. Am I missing something or is this bugged to the max?