This is the most bizzare problem I've had with any game. I was trying to debug the issues with crashes and freezing and hoping the developer console would tell me more what's going on. It ended up corrupting my save game, and also the corrupted save was synchronized to the Steam cloud, so now I can't even play anymore because it keeps downloading the corrupted save.
My only option was to refund the game! (Or so I thought. Is there any way to delete cloud saves? )
The first action forced upon you in the game, you must make the choice to save Fergus or Wyatt. For those who did not play Wolfenstein: The New Order, this may make little sense. In the beginning.
Hmm. That's messed up! One thing that might have worked would be logging into Steam's offline mode, deleting the game's save file, and starting a new game. In theory, the next time you log into Steam properly and try to play Wolfenstein, it'll notice a disparity in the save files and ask if you want to keep the one on your computer or download the one from the cloud.
That's how I fixed a corrupted Plants vs. Zombies cloud save a few years ago.