Hi, I am an AC Valhalla player and have been experiencing a bug for over a month that prevents me from starting Mastery Challenges. After seeing the opening cinematic and unlocking the mission "A Divine Event" I went to the crash site to talk to the mysterious character, but despite the command to interact with him, the dialogue video does not start. This happens to me with all the characters in the game, with the totems for customizing the village and also with the drakkar so it is impossible for me to do even the simplest things like riding a horse or starting any secondary mission or event. This bug occurred after the update that introduced the Mastery Challenges event and despite having followed several other players' advice on various forums I have not been able to fix it myself. I have updated the game with the latest patch released and it always gives me the bug. Thank you.