The servers are goddamn buggy
 

Yes, at least on USEast. First, I was doing a Baal run yesterday, and after killing all the monsters in his throne room, he just sat there casting decrepify and didnt start summoning any minions. I figured we missed a monster, so we went and killed every monster in the level, and he still didnt summon his minions...we ended up having to start a new game.

And then today, I was going to do Andy with my necro, and the zombies in the catacombs were somehow bugged as that they couldnt get hit by physical damage. I had 3 skellies pounding away at a single amp'ed regular zombie, and it was as if his defense was 10000...they could not hit him. I was able to kill them with my act 1 merc which had a bow with lightning damage on it though...I noticed when the merc fired Fire Arrows they did no damage either.

The Baal thing happened to me too, some sorc was telling us it was a bug and we had to go outside of the throne room, then come back in. When we did, the minions and bartuc and Ventar(did I get that right?) came out all at once.

That happens with Baal a shit load. Just go outside of the throne and wait for his ass to laugh, then when you go back in, he will spawn the next set of monsters. Only thing is, you have to do that after every set of monsters, which is annoying.

That isn't really annoying... the annoying thing is someone WILL NOT listen to you. Be it a low level amazon leecher or a high level druid, they will stay in the throne and ignore your request.