I tried to load one of the new saves on another computer and it ran fine. So I don't think that it has to do with the save itself.
Does anyone now how to fix this? I'v tried to reinstall and deleting the ini-files in the save game-folder and the files under AppData\Local. But it didn't solve anything.
I've also tried starting a completly new game, and it works fine untill I leave the doc's house.