Below you can see the changelog, which were made on 5.4.8 for 2.5 last months, from 13.10.16 to 29.12.16:

Status: applied for all realms.

General:

- Fixed a common problem when doors didn't open after killing the bosses in some dungeons.
- Fixed saving of resources (mana, energy, etc) after the death.
- Fixed the definition of the main stats by specialization for Enhancement Shaman and Mistweaver Monk.
- Fixed problems with obtaining the achievements, where the criterion devided Horde and Alliance (for example: "Trick or Treat" in Azeroth).
- Fixed damage calculation for the attacks by left hand for mobs.
- Fixed DynamicObject displaying in whichever is player friendly to DynObject's owner or not (for example: Smoke Bomb).
- Visibility is now updated in a radius of 10 meters, once per second, rather than by overall timing for players who have stealth \ invisibility.
- Fixed a possible exploit with farming of honorable kills at momentary resurrection.
- Now with the successful roll of bonus loot better things might be dropped.
- Pets will now properly receive Melee, Ranged, Spell Hit rating from owner with their's calling and with updating of these ratings by the owner.
- Fixed an invite to the chat channel and displaying of the players in the channel.
- Added rewards for achievements: The Zandalari Prophecy, Rumbles of Thunder, Gods and Monsters.
- Fixed the achievements: Explore Southern Barrens, 20 Dungeon Quests Completed, E'ko Madness.
- Improved the logic of inclusion seasonal quests (such as the Darkmoon Faire).
- Fixed a calculation of the energy regeneration from the haste.
- Fixed handling of criteria for some achievements in the dungeons.
- Fixed loading of mobs equipment from the last Pandaria content.
- Fixed bugs with raid profiles.
- Fixed performance of seasonal quests that do not require any conditions (just to accept it and to complete) if the character have doing the quest in the past year.
- Fixed a calculation of the attack speed for hunter's pets and for DK's ghouls.

- Fixed 6 reasons of server crash.

Instances and raids:

Siege of Orgrimmar:

- Norushen:
* Fixed an exploit with Corrupción aura.
* Fixed Manifestación de la corrupción mob spawn from Desgarrado.
* Fixed timer of Ráfaga de ira.

- Sha of Pride:
* Fixed an exploit with Orgullo aura.

- Iron Juggernaut:
* Fixed damage done to player from Crawler Mine Blast.
* Fixed spawn of Crawler Mine in siege mode.

- Thok the Bloodthirsty:
* Fixed a bug with energy boost.
* Fixed Aceleración aura reset at the beginning of 2nd phase.
* Fixed a bug, when trash before a boss could resurrect in 5 minutes after its death.
* Fixed a bug, when boss stayed in chains after wipe and instance reload.
* Added loot.
* Fixed boss health amount for 25 people mode.
* Fixed possibility to get keys from cages at 25 people mode.

- Galakras:
* Flames of Galakrond now will be applyed at random player, not depending on distance.

- Immerseus:
* Boss will interrupt casting spells.
* Fixed a bug, when Contaminated Puddle and Sha Puddles moved slowly.
* Fixed possibility to heal Contaminated Puddle by Monk spheres.
* Fixed decreasing damage of Sha en erupción depending on puddles health amount.
* Fixed increasing damage of Residuo de sha.
* Fixed radius of Salpicadura de sha damage.
* At transient phase Sha Eruptions will move to boss pool.
* Decreased the size of Explosión corrosiva cone.
* More work over casting spells next to Contaminated Puddles.
* Decreased move speed of Charco purificado.

- Pandaren Spoils:
* Fixed using spells of Kun Da.
* Fixed using spells of Zu Yin.
* Fixed using spells of Jun Wei.
* Fixed using spells of Xiang Lin.
* Fixed a bug, when one box could be used more than once in a short time.
* Added forged in battle items to loot.

- General Nazgrim:
* Fixed spawn of additional mobs when boss reaches 10% of maximum health.

- Siegecrafter Blackfuse:
* Fixed a bug, when player died from falling on conveyor line.
* Fixed a bug, when boss did not attack players.
* Fixed Matriz defensiva potenciada.
* Fixed work of shockwave missile turrets.
* Fixed work of crawler mines.
* Fixed work of Laser turrets.
* Fixed work of Electromagnet.
* Fixed ¡Taladros! ¡Imanes! ¡Láseres!.
* Fixed range of actions for Misil de ondas de choque.
* Added loot.
* Fixed an exploit with Carga electrostática aura.
* Fixed inscreasing damage done to Shredders depending on Carga electrostática aura.

- Paragons of the Klaxxi:
* Implemented boss script (with loot).

- Garrosh Hellscream:
* Implemented boss script (with loot).

Others:

- Fixed an exploit with possible control of bosses.
- Added NPC before Paragons of the Klaxxi.
- Added Derribapuertas Sav'ah.
- Added Atracavientos Tar'rath.
- Added Gran maestro alquimista Ki'xen.
- Fixed a bug with entrance scene to Asediador Mechanegra.
- Fixed an exploit that allowed to interrupt casts of bosses by taking them into textures.
- Added missing equipment to mobs.
- Added Segador Kor'kron.
- Added Ichor of Y'Shaarj.
- Added undefined.
- Fixed disappearing of Manifestación after killing the summoner.
- Fixed bugs with loot when players got less items.
- Fixed bugs with opening doors.
- Fixed possible bugs with event activation.
- Implemented heroic mode of raid, 8 bosses available.

World bosses:

A Celestial Experience:

- Yu'lon:
* Fixed often damage from Llamarada de fuego de jade.

Ordos:

- Added bonus loot.

Mogu'shan Vaults:

- The Spirit Kings:
* Escudo de la oscuridad won't proc from DoTs anymore.

Serpentshrine Cavern:

- Fixed possibility of fishing in the instance.

Throne of Thunder:

- Fixed bonus loot from bosses.
- Council of Elders:
* Fixed an exploit with boss farm.

The Arcatraz:

- Fixed door opening after killing bosses in heroic mode.

Scarlet Halls:

- Implemented scripts of mobs and bosses in the instance.

Arena and BG:

- Battle Fatigue should be permanent at BG and arenas + it is now applied when you enter arena, not after the gates open.
- Fixed getting deserter for leaving arena with /afk.
- Fixed stack of Champiñón salvaje in starter room of arena and BG, should reset after start.
- Fixed position of Visión de las Sombras for Dalaran Sewers and Blade's Edge Arena.
- Implemented asynchronous pet loading (optimization).
- Implemented multithreading work of mych cross-server functions (optimization).
- Fixed client crash.
- Fixed display of arena frames if one of players refused to join.
- Fixed horde and alliance players amount ins BG statistics, could be incorrect before.
- Fixed a bug, when players could join arena or BG with deserter aura.
- Fixed player log out processing.
- Fixed arena selection for maneuver, now will be selected the one that a player chose.
- Another try to fix a bug with objects display.
- Arena frames should be displayed only if all players are at the arena.
- Fixed leaving arena using the eye on a minimap or /afk command.
- Player will get Deserter for rejecting arena/rated BG invitation. Will not work for simple random BG.
- Fixed leaving from maneuvers using /afk.
- Fixed display of players that left BG in a list.
- Fixed an exploit at The Eye of the Storm, that allowed to teleport to your base with a flag by jumping into the abyss.

- Fixed 4 reasons of cross-server crash.

Spells and Talents:

Monk:

- Fixed Healing spheres (usual and from mastery), shouldn't heal a target with full health.
- Fixed PvP power bonus for Crisálida vital.
- Fixed Glyph of Water Roll
- Fixed Glyph of Spirit Roll
- Fixed all known problems with Anillo de paz.
- Players copy from Transcendencia now disappears after a players moves 100 yards from it
- Fixed range of spell Legado del Emperador.
- Viento de jade impetuoso and Anillo de paz no longer ignore LoS.
- Fixed Incapacitar when using on Death Knight.

Paladin:

- Fixed a bug with combat using Señal de la Luz and Llama eterna.
- Fixed triple healing from Llama eterna, when paladin heal self while Guardián de los antiguos reyes is active.
- Spell Señal de la Luz shouldn't keep paladin in combat, when HoT heal someone in party.
- Healing from Señal de la Luz shouldn't changed by heal modifiers.
- Luz cegadora no longer ignore LoS.
- Fixed Glyph of Inquisition.
- Fixed Glifo de Martillo del honrado.
- Fixed a bug, when Gran cruzado did not proc due to enormous cooldown.
- Fixed Glyph of Burden of Guilt, shouldn't apply on target with Deterrence.
- FixedGlifo de Súplica divina.

Mage:

- Fixed a bug, when Invisibilidad was not removed by Porrazo, if it was applied in the first seconds.
- Robar hechizo should dispel Escudo de tierra and Explosión de humo, not steal them.
- Fixed stack for talent Escudo temporal.
- Damage against Reflejo exacto should increased by PvP power.
- Fixed health amount of Reflejo exacto.
- Fixed diminishing group for Combustión.
- Fixed abuse of proc ¡Piroexplosión!.
- Trizar now affects on Orbe congelado aswell.
- Spell Congelar will no longer proc Dedos de Escarcha, if spell didn't hit a target due to immunity.
- Fixed a bug, when spell Dedos de Escarcha didn't proc, while mage was under Fear effects.
- Fixed a bug, when Anillo de Escarcha under effect of Presencia mental instantly freeze a target, without delay.
- Fixed Glyph of Counterspell.
- Fixed Glyph of Infernal Blast.
- Fixed a bug, when after remove of Glifo de Elemental desatado pet model remained the same.
- Fixed Glifo de Lenguaje Arcano.
- Fixed all known problems with spell Alterar el tiempo.
- Fixed a bug, while Anillo de Escarcha is active, player couldn't get Presencia mental.
- Recieved damage now can interrupt Invisibilidad.
- Fixed a bug, when using Reflejo exacto reset the current target even for allies.
- Fixed spell proc Resguardo de hielo.
- Fixed the time between healing a target, that is under effect of Polimorfia.
- Fixed aura remove Dedos de Escarcha, now consumes on cast, instead of hit.
- Fixed a bug, when Anillo de Escarcha didn't interrupt while receive periodic damage.
- Fixed all known problems with pet spell Water Bolt
- Fixed interrupt Invisibilidad from DoT's, when damage was fully absorbed, but invisibility was still interrupted.
- Fixed a bug, when mage did not get Dedos de Escarcha from Congelar, if one of targets did not have immune and other had..

Warrior:

- Fixed a bug, when 4P bonus from Equipo de batalla de Gladiador didn't increase a movement speed after cast Salto heroico.
- Fixed a bug, when Heridas profundas was applied even on spell miss.
- Fixed all known bugs with spells: Estandarte de mofa, Estandarte desmoralizador and Estandarte de calavera.
- Fixed a bug, when Cargar and Intervenir didn't interrupt, if warrior receive a crowd control effect.
- Baño de sangre no longer proc on self.
- Fixed 4P T15 bonus Placas del último mogu.
- Fixed interaction of Reflejo de hechizos and Atracción letal.
- Fixed a bug, when Glyph of Die by the Sword didn't work in fury spec.
- Fixed huge delay between landing and damage using Salto heroico.
- Fixed a bug, when Reflejo de hechizos reflect knockback spells.
- Fixed proc of Glifo de Viento fiero.
- Fixed proc conditions Glifo de Viento fiero, should proc only from Glifo de Viento fiero.
- Fixed speed of Salto heroico.

Druid:

- Fixed level of summoned NPC by spell Force of Nature in feral spec.
- Now druid can't use Barkskin, when nature school is locked.
- Fixed a bug, when after cast of Génesis, spell Rejuvenecimiento lose ticks
- Fixed a bug, when effect of Alma del bosque didn't work on allies.
- Fixed all known bugs with spell Champiñón salvaje.
- Fixed interaction Alma del bosque with Génesis.
- Fixed a bug, when after the first cast Simbiosis it couldn't be used again, before relog.
- Treants, that summoned by spell Force of Nature, now have owner Attack power, Spell power, PvP power and mastery.
- Fixed a bug, when some spells passed through Cloal of Shadows from http://mop.wowroad.info/?spell=31224[/url]
- Fixed Simbiosis for death knights
- Floración now does not let into combat.
- Fixed Corazón de lo Salvaje for cat and bear form.
- Spell Vigilia de la Naturaleza shouldn't deal damage to invisible targets.
- Fixed Glifo de Testarazo.
- Fixed flying speed using Carga salvaje.
- Rugido desorientador now correctly removes Acechar.
- Fixed increasing duration of spell Destripar using ¡Devastar!.
- Fixed a bug, when Glifo de Forma felina was working always.
- Fixed a bug, when Descarga tormentosa passes through Disuasión that was recieved by Simbiosis.
- Fixed spell Reflejo exacto and Glifo de Forma felina that was recieved by Simbiosis.
- Treants from Fuerza de la Naturaleza will no longer cast on target Atontado.
- Fixed a bug, when after dispel Enjambre feérico slow effect still remained.
- Fixed Glyph of Blooming.

Priest:

- Fixed all known bugs with spell Subyugar mente.
- Toque de la tumba shouldn't interrupt Palabra Sagrada: Condena.
- Veneno hiriente shouldn't affect Espíritu guardián.
- Fixed a bug with Reflexión divina, when was possible to apply two the same Palabra de poder: escudo.
- Fixed all known bugs with Pozo de Luz.
- Espíritu guardián should be affected by PvP power and Fatiga de batalla.
- Fixed a bug, when Disipación en masa with glyph, didn't dispel such effects as Ice Block on a large distance.
- Spells Aliento de dragón and Rugido desorientador will no longer remove Figura espectral.
- Fixed a bug, when 2P set bonus Investidura de Gladiador procs, even if it wasn't equipped.
- Fixed calculation for all absorb shields, critical strike chance shouldn't affect them.
- Fixed a bug, when Maligno psíquico can use Terror psíquico on target in stealth.
- Now, if shadow school is locked, then Dispersión locked aswell.
- Player of Mending now affected by PvP power
- Spell Gracia shouldn't affect absorb amount from Palabra de poder: escudo.
- Fixed Divine Aegis.
- Fixed delay for Relevo del vacío.
- Absorb from Coraza espiritual now affected by Atenuación.
- Fixed interaction Relevo del vacío and Salto de fe with mage that under effect Bloque de hielo.
- Fixed Glifo de Levitar.
- Fixed Glifo de los cielos.
- Fixed using Espíritu guardián, if priest is under crowd control effects, but also in stun.
- Fixed many bugs with spell Maligno psíquico
- Foxed a bug, when Espíritu guardián didn't heal in fear effects.
- Fixed a bug with Glyph of Shadow
- Fixed Glyph of the Heavens

Death knight:

- Fixed a bug, when Conversión canceled, if DK got Crowd Control effect.
- Fixed attack power coefficient for spell Muerte y descomposición.
- Fixed parry chance for DK.
- Fixed a bug, when Atracción letal the main cast was passes a check, but the second not, and spell didn't work.
- Many fixes for Arma de runa danzante.
- Fixed a bug, when Conversión didn't heal a DK when he was under crowd control effects.
- Fixed a bug, when with Conversión, cpell Hervor de sangre and bonus from Guanteletes de placas de tinieblas de Gladiador orgulloso didn't work.
- Fixed important bug, when DK talent Corrupción rúnica increases RPPM from items by several times.
- Fixed a bug, when Socorro oscuro procs from all spell, not only from Death strike.
- Glyph of Death's Embrace shouldn't proc, when cast on target with full health.
- Añublo profano no longer ignore LoS.

Shaman:

- Fixed damage amount, that required for break Maleficio.
- Fixed a bug, when Tótem Elemental de Fuego and Tótem Elemental de Tierra puts allies in combat
- Fixed Glifo de Lobo espiritual.
- Fixed Glifo de Corte de viento.
- Fixed Glifo de Fijación astral.
- Fixed a bug, when Tótem de Surcar el viento didn't have a model.
- Fixed Glifo de Tierra eterna.
- Tótem Pillaterra no longer ignore LoS.
- Fixed Glyph of Cleansing Waters.
- Fixed Glifo de Raptores espirituales.
- Tótem Elemental de Tierra and Tótem Elemental de Fuego when they are in combat, will put a shaman in combat aswell.

Rogue:

- Now Esfumarse correctly working with Subterfuge, if rogue receive AOE damage.
- Fixed Glifo de Recuperación.
- FIxed Glifo de velocidad borrosa.
- Subterfugio should not proc whe player under effect Esfumarse.
- Spells Hemorragia, Ruptura and Garrote no longer remove Sigilo from DoT damage.
- Fixed working Anticipación from Golpe revelador, when it addded 1 combo point with a 20% chance.
- Capa y daga no longer working, if rogue used Danza de las Sombras.
- Fixed a bug, when after using Esfumarse rogue instantly turn back into combat. Added delay for half second.
- Bomba de humo should apply own effect instantly and without delay.
- Fixed a bug, when rogue can't use a stealth anymore after getting under Flare, with enabled Vanish.
- Fixed a bug, when Esfumarse sometimes didn't remove a combat.

Warlock:

- Fixed Glyph of Fear.
- Fixed Glifo de Mano de Gul'dan
- Voluntad indomable spell should remove silence effect (for example from Garrote).
- Fixed a bug, when Orden demoníaca worked more than once and went to diminishing.
- Changes in rules for copying spells by using Estragos. Now spells of Orden demoníaca and Maldición de los Elementos can be copied also.
- Llamas infernales can be cast while moving.
- Fixed possibility to use spells of Orden demoníaca if a player has used Grimorio de sacrificio before.
- Fixed a bug, when Bloqueo de hechizo got by Grimorio de sacrificio was not copied by Estragos.
- Fixed all known bugs in work of Portal demoníaco.
- Now Ola de caos and Toque de caos hit rogue under Cloak of Shadows.
- Fixed a bug, when Llamas de Xoroth did not summon the last pet.
- Now Invocar manáfago will use Mordedura de las Sombras only if he has more than 80 energy.
- Núcleo de magma - excluded a variant, when it made Fuego de alma instant, now bonus gives effect of one stack.
- Fixed a bug, when Quemadura de las Sombras did not deal damage in some cases when target was healed in a moment of dealt damage and got more than 20% HP.
- Ola de caos and Toque de caos will now correctly pass Capa de las Sombras and will not be decreased by Difuminar magia.
- Fixed attack power of Invocar guardia de cólera.
- Fixed duration of Explosión óptica and Bloqueo de hechizo auras.
- Fixed proc of Ocaso.
- Fixed enormous duration of Bloqueo de hechizo.
- Llamas infernales no longer ignore LoS.

Hunter:

- Fixed a bug, when Golpes de traslación could proc while pet was under control.
- Fixes of damage stack of Disparo explosivo.
- Fixed Glifo de Engaño resistente.
- Fixed Glifo de Cólera infinita.
- Fixed trap proc radius (was higher than should).
- Fixed Glifo de Redirección.

Spells and talents, others:

- Fixed a problem where some of the aura worked in full operation for low levels, for example: Scroll of Stamina IX and others.
- Fixed a bug with stacking of auras that increase stamina.
- Fixed an exploit with WPE, that allowed to switch single-target spell to dest-target and spam spells under the target, for example undefined.
- Fixed scaling of auras that influence attack/cast speed, all effects should multiply not summarize.
- Removed the second test of LoS for single-target spells, because one test has already been made, and the second is simply not needed. In addition, it led to cases where a player has moved between the first and second test, then castes passes, but the effect is not applied.
- Fixed a bug, when some spells (for example: Marca de lo Salvaje of a druid) applied only to a party, but not to a raid.
- Fixed a bug, when summoned creatures lost Fatiga de batalla.
- Fixed visual effect of Sálvese quien pueda.
- Fixed an exploit that allowed to interrupt casts of bosses by running away.
- Now Fusión de las sombras absorbs spell only in case if a it was used in a moment when spell hit a player.
- Now, damage done to absorb shield control auras will be removed.
- Fatiga de batalla should be applied to all creatures, controlled by player, not only pets.
- Fixed Lanzar, should not have cooldown.

Items:

- Fixed a bug, when Diamante de fuego celeste del trueno gave +20,000 to haste rate.
- Fixed a bug with PvP power, when Hoja rauda de Gladiador orgulloso is used.
- Fixed Well Fed stacks of different items.
- Fixed work of items for banishing elementals in Arathi Highlands Talismán del trueno.
- Fixed stacking of undefined aura up to 5 times from undefined of Equipo de batalla del asesino espinoso rogue set.
- Fixed stamina increase by Gran festín pandaren.
- Fixed target amount, that receive heal from Jina Kang, Amabilidad de Chi-Ji.
- Fixed Grog espectral.
- Fixed learning Rata de madriguera oronda.
- Fixed Barril de maestro cervecero honorario.
- Fixed Sombrero de zahorí descolorido.
- Fixed Caparazón endurecido.

All Data Base fixes (quests, creatures, loot etc) you can look at this section (from 2016-10-13 tо 2016-12-29), with messages from Herald.

Do not forget to delete the Cache folder from the root folder of the game after each update.