Blizzard has just announced a server-side hotfix that addresses issues related to gameplay and service. Since this is a server-side patch you do not need to download anything or apply any thing to your client. Hope that a client side patch is next to address the crashes.
Note: The hotfix notes may contain spoilers if you have not yet finished the game on Normal mode, and are also very long. You have been warned.
May 23
Monsters
Mehtan the Necromancer and his skeletons can no longer be used to kill other monsters which have been kited to their location before or after the "Restless Sands" event
May 22
General
Players will now receive an error message when attempting to remove a gem from an item with no sockets (rather than disconnecting)
Players will now properly have their casting interrupted when attacked while performing resurrect on a fallen group member
Resolved over 30 game and service crashes affecting players
Classes
Demon Hunter
Active Skills
Smoke Screen
Duration reduced from 2 seconds to 1 second (tooltip will still show 2 seconds)
Skill Rune - Lingering Fog
Now increases the duration of Smoke Screen to 1.5 seconds (tooltip will still show 3 seconds)
Monk
Active Skills
Fists of Thunder
Skill Rune - Quickening
Fixed an issue that was causing spirit regeneration to incorrectly trigger off critical hits from other sources, such as Sweeping Wind
Mantra of Healing
Mantra of Healing will now correctly provide only two times the base healing effect for the first 3 seconds after activation, down from four times the base healing effect (tooltip will still show the old value)
Skill Rune - Boon of Protection
A maximum absorption amount has been set to 1000 Life. This skill will be redesigned in an upcoming patch.
Wizard
Active Skills
Arcane Torrent
Skill Rune - Cascade
Fixed an issue that was causing Arcane Torrent to fire 3 new missiles per kill instead of only 1 new missile per kill
Number of simultaneously missiles generated from this rune will now cap at 10 missiles
Energy Armor
Skill Rune - Force Armor
Amount of damage absorbed from a single attack will now cap at 100% of a player’s maximum Life
Items
The chest spawn in the Town Cellar in Alcanus has been changed from a 100% chance to spawn a Resplendant chest to a 50% chance to spawn a Normal chest
Players can no longer dual-wield two-handed weapons
May 18
Classes
Monk
Active Skills
Serenity
Skill Rune - Tranquility
Duration of immunity granted to nearby allies from crowd control effects reduced from 2 seconds to 1 second
Encounters
Players will no longer remain invulnerable to attacks after defeating Diablo.
Players can no longer become stuck during Diablo’s Shadow Grab ability if a player blinds Diablo while Shadow Grab is being cast.
Items
Equipping a shield on a follower as a demon hunter will no longer disconnect you from the game.
Quests
Act I
Players can now always interact with Karyna during the quest and quest step "Trailing the Coven : Talk to Karyna" when they resume from a save.
Act II
The Enchantress will now always appear during the quest and quest step "Shadows in the Desert : Disrupt the Hidden Conclave."
Act IV
Tyrael will now always be present for the in-game cutscene during the quest and quest step "Prime Evil : Climb to the Pinnacle of Heaven in the Silver Spire."