After the Talmberg castle gets taken and you are given the task to sneak in the castle, I get into a loading screen that doesn’t end. 62 hours in 
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I have the exact same problem. tried alt tabbing, restarting from previous save etc etc. nothing helped.
I had this bug on Payback quest. Tried some different things people suggested in Discord.
- restart pc
- load earlier save
The only thing that worked for me was to start a whole new game and ignore sidequests, or do as few as possible and just power through the mainquest. Also had this bug on the quest Cherchez La Femme, only since it wasn’t a MQ I could just load up a save and ignore it.