Yea I have been monitoring that situation all day. I appears that talking to any NPC was crashing the server. I did shut down the server for a while there to do further live testing. I've since applied an emergency patch for this so everything should be back to normal.
The following wasn't planned they are just coming along with the patch above.
Bug: Mob dies if a player dies in a party.
-- Patched: Ready for testing.
---- If you are in a party the mob should stay alive if one of you dies.
----- I was in process of advancing the code on this but I stopped for the NPC patch. Currently a mob will flat out disappear instead of die. Previously XP could be gained by doing this. This could be buggy atm like not despawn/die if your in a party and only one zones.
Bug: Sometimes you die when the mob dies.
-- Patched: Ready for testing.
---- This was a lol bug moment I found. I even had invincible on.
Bug: Talking to a NPC crashes the server.
-- Patched: Ready for testing.
---- I tried a few npcs that were crashing the server before the patch and they were working.
Bug: Auction house doesn't work.
-- Patched: Ready for testing.
---- You still can't sell stacks of items but singles appear to be working. Needs tested though.