Was in a game with my buddy, Day 50, he has a decent PC. When we went down in to the caves at first it worked, but then we tried to enter simultaneously one time and then I got kicked out, think message was server was not available. After that every time I went in or out it crashed my client.
I asked him to exit the game and restart the server, but then he got an error message that he couldn't do so.
He tried to roll it back but that was also unsuccessful.
Links to known issues would be good.