Originally Posted by maotd

- Raid boss sharing don"t work too. I tried to share it with friends to hit it three times for daily quest. 2nd time I fought it, the game asked me for sharing, AGAIN, and error occured. Restarted game and my raid boss was killed by a random player.
In other words, RB are shared to everyone and battle your own boss more than one time leads to a fatal error.

When asked for the second time to share a boss, close the popup through the X in the top right (close window icon) instead of sharing. The RB is still shared with everybody, but at least you won't crash your game.