I have had this problem on several occasions. After visiting Vranik and being captured by Erik, to later be freed by Zbyshek, you escape Vranik. Once you’ve escaped you talk to Zbyshek and a cutscene triggers where you both walk to Rattay. After a short cutscene where Radzig requests to speak privately, the game cuts to an infinite loading screen. I’ve found no solutions to this problem and have tried almost everything.
I saw someone mentioning it to one of the devs on twitter today (and the dev responded), so at least they’re aware of it.
I really hope so. I love this game and I’ve had this same problem for the past week, preventing me from playing it.
Mail your bug to Support@kingdomcomerpg.com just to be certain, they say they read all of these and things posted on forums can get missed.