I have just played with a friend in MP.

Fight 1 was really bugged, the Crucible had lava on it, meaning we couldn't get any ice on it as it melted immediately.

Fight 2 was also bugged; now the Crucible looked normal and we could cast Ice Knife on it, but Grym would not do any saving throw when walking on it. He completely ignored the ice.

It wasn't like this before, it made the fight a real chore.