Batman Arkham Knight is still broken but developers Rocksteady are on the case
The latest news is that developer Rocksteady Studios is on the case. Where were they earlier? Sometimes on huge projects like Arkham Knight there's one main version which is developed by the key company - in this case Rocksteady created the Xbox One and PS4 versions of the game. Then another company - Iron Galaxy in this example - comes along and uses that base code to create a PC port of the game.
And it seems Iron Galaxy (the makers of Divekick and porters of a bunch of other titles) didn't do such a good job, so its fallen to Rocksteady to get stuck in and fix things. The news comes from the Warner Bros Games forums where people have been desperately looking for answers - rather than just a refund. A full list of issues Rocksteady is working on has also been posted.