diff --git a/src/BlockEntities/BlockEntityWithItems.h b/src/BlockEntities/BlockEntityWithItems.h
index bf6289a2f..918781a00 100644
--- a/src/BlockEntities/BlockEntityWithItems.h
+++ b/src/BlockEntities/BlockEntityWithItems.h
@@ -11,6 +11,7 @@
 
 #include "BlockEntity.h"
 #include "../ItemGrid.h"
+#include "../UI/WindowOwner.h"
 
 
 
@@ -22,6 +23,7 @@ class cBlockEntityWithItems :
 	// tolua_end
 	// tolua doesn't seem to support multiple inheritance?
 	, public cItemGrid::cListener
+	, public cBlockEntityWindowOwner
 	// tolua_begin
 {
 	typedef cBlockEntity super;
@@ -77,6 +79,11 @@ protected:
 		ASSERT(a_Grid == &m_Contents);
 		if (m_World != NULL)
 		{
+			if (GetWindow() != NULL)
+			{
+				GetWindow()->BroadcastWholeWindow();
+			}
+
 			m_World->MarkChunkDirty(GetChunkX(), GetChunkZ());
 		}
 	}
diff --git a/src/BlockEntities/ChestEntity.h b/src/BlockEntities/ChestEntity.h
index 4110de1f3..ce16f84d7 100644
--- a/src/BlockEntities/ChestEntity.h
+++ b/src/BlockEntities/ChestEntity.h
@@ -2,7 +2,6 @@
 #pragma once
 
 #include "BlockEntityWithItems.h"
-#include "../UI/WindowOwner.h"
 
 
 
@@ -23,8 +22,7 @@ class cNBTData;
 
 // tolua_begin
 class cChestEntity :
-	public cBlockEntityWithItems,
-	public cBlockEntityWindowOwner
+	public cBlockEntityWithItems
 {
 	typedef cBlockEntityWithItems super;
 	
diff --git a/src/BlockEntities/DropSpenserEntity.cpp b/src/BlockEntities/DropSpenserEntity.cpp
index 7c9a40ce6..81df0fc8c 100644
--- a/src/BlockEntities/DropSpenserEntity.cpp
+++ b/src/BlockEntities/DropSpenserEntity.cpp
@@ -99,13 +99,6 @@ void cDropSpenserEntity::DropSpense(cChunk & a_Chunk)
 	}
 	m_World->BroadcastSoundParticleEffect(2000, m_PosX, m_PosY, m_PosZ, SmokeDir);
 	m_World->BroadcastSoundEffect("random.click", m_PosX * 8, m_PosY * 8, m_PosZ * 8, 1.0f, 1.0f);
-	
-	// Update the UI window, if open:
-	cWindow * Window = GetWindow();
-	if (Window != NULL)
-	{
-		Window->BroadcastWholeWindow();
-	}
 }	
 
 
diff --git a/src/BlockEntities/DropSpenserEntity.h b/src/BlockEntities/DropSpenserEntity.h
index f2f1eba36..47d3bd492 100644
--- a/src/BlockEntities/DropSpenserEntity.h
+++ b/src/BlockEntities/DropSpenserEntity.h
@@ -11,7 +11,6 @@
 #pragma once
 
 #include "BlockEntityWithItems.h"
-#include "../UI/WindowOwner.h"
 
 
 
@@ -31,8 +30,7 @@ class cServer;
 
 // tolua_begin
 class cDropSpenserEntity :
-	public cBlockEntityWithItems,
-	public cBlockEntityWindowOwner
+	public cBlockEntityWithItems
 {
 	typedef cBlockEntityWithItems super;
 
diff --git a/src/BlockEntities/EnderChestEntity.h b/src/BlockEntities/EnderChestEntity.h
index 0ee3cab3b..45beee45f 100644
--- a/src/BlockEntities/EnderChestEntity.h
+++ b/src/BlockEntities/EnderChestEntity.h
@@ -2,7 +2,6 @@
 #pragma once
 
 #include "BlockEntityWithItems.h"
-#include "../UI/WindowOwner.h"
 
 
 
@@ -23,8 +22,7 @@ class cNBTData;
 
 // tolua_begin
 class cEnderChestEntity :
-	public cBlockEntityWithItems,
-	public cBlockEntityWindowOwner
+	public cBlockEntityWithItems
 {
 	typedef cBlockEntityWithItems super;
 	
diff --git a/src/BlockEntities/FurnaceEntity.h b/src/BlockEntities/FurnaceEntity.h
index b08187300..5e08ae37a 100644
--- a/src/BlockEntities/FurnaceEntity.h
+++ b/src/BlockEntities/FurnaceEntity.h
@@ -2,7 +2,6 @@
 #pragma once
 
 #include "BlockEntityWithItems.h"
-#include "../UI/WindowOwner.h"
 #include "../FurnaceRecipe.h"
 
 
@@ -23,8 +22,7 @@ class cServer;
 
 // tolua_begin
 class cFurnaceEntity :
-	public cBlockEntityWithItems,
-	public cBlockEntityWindowOwner
+	public cBlockEntityWithItems
 {
 	typedef cBlockEntityWithItems super;
 	
diff --git a/src/BlockEntities/HopperEntity.cpp b/src/BlockEntities/HopperEntity.cpp
index 2255cad64..31b23ac99 100644
--- a/src/BlockEntities/HopperEntity.cpp
+++ b/src/BlockEntities/HopperEntity.cpp
@@ -7,10 +7,12 @@
 #include "HopperEntity.h"
 #include "../Chunk.h"
 #include "../Entities/Player.h"
+#include "../Entities/Pickup.h"
 #include "../Bindings/PluginManager.h"
 #include "ChestEntity.h"
 #include "DropSpenserEntity.h"
 #include "FurnaceEntity.h"
+#include "../BoundingBox.h"
 
 
 
@@ -190,8 +192,87 @@ bool cHopperEntity::MoveItemsIn(cChunk & a_Chunk, Int64 a_CurrentTick)
 /// Moves pickups from above this hopper into it. Returns true if the contents have changed.
 bool cHopperEntity::MovePickupsIn(cChunk & a_Chunk, Int64 a_CurrentTick)
 {
-	// TODO
-	return false;
+	UNUSED(a_CurrentTick);
+
+	class cHopperPickupSearchCallback :
+		public cEntityCallback
+	{
+	public:
+		cHopperPickupSearchCallback(const Vector3i & a_Pos, cItemGrid & a_Contents) :
+			m_Pos(a_Pos),
+			m_bFoundPickupsAbove(false),
+			m_Contents(a_Contents)
+		{
+		}
+
+		virtual bool Item(cEntity * a_Entity) override
+		{
+			ASSERT(a_Entity != NULL);
+
+			if (!a_Entity->IsPickup() || a_Entity->IsDestroyed())
+			{
+				return false;
+			}
+
+			Vector3f EntityPos = a_Entity->GetPosition();
+			Vector3f BlockPos(m_Pos.x + 0.5f, (float)m_Pos.y + 1, m_Pos.z + 0.5f); // One block above hopper, and search from center outwards
+			float Distance = (EntityPos - BlockPos).Length();
+
+			if (Distance < 0.5)
+			{
+				if (TrySuckPickupIn((cPickup *)a_Entity))
+				{
+					return false;
+				}
+			}
+
+			return false;
+		}
+
+		bool TrySuckPickupIn(cPickup * a_Pickup)
+		{
+			for (int i = 0; i < ContentsWidth * ContentsHeight; i++)
+			{
+				if (m_Contents.IsSlotEmpty(i))
+				{
+					m_bFoundPickupsAbove = true;
+					m_Contents.SetSlot(i, a_Pickup->GetItem());
+					a_Pickup->Destroy(); // Kill pickup
+
+					return true;
+				}
+				else if (m_Contents.GetSlot(i).IsEqual(a_Pickup->GetItem()) && !m_Contents.GetSlot(i).IsFullStack())
+				{
+					m_bFoundPickupsAbove = true;
+
+					int PreviousCount = m_Contents.GetSlot(i).m_ItemCount;
+					a_Pickup->GetItem().m_ItemCount -= m_Contents.ChangeSlotCount(i, a_Pickup->GetItem().m_ItemCount) - PreviousCount; // Set count to however many items were added
+					
+					if (a_Pickup->GetItem().IsEmpty())
+					{
+						a_Pickup->Destroy(); // Kill pickup if all items were added
+					}
+					return true;
+				}
+			}
+			return false;
+		}
+
+		bool FoundPickupsAbove(void) const
+		{
+			return m_bFoundPickupsAbove;
+		}
+
+	protected:
+		Vector3i m_Pos;
+		bool m_bFoundPickupsAbove;
+		cItemGrid & m_Contents;
+	};
+
+	cHopperPickupSearchCallback HopperPickupSearchCallback(Vector3i(GetPosX(), GetPosY(), GetPosZ()), m_Contents);
+	a_Chunk.ForEachEntity(HopperPickupSearchCallback);
+
+	return HopperPickupSearchCallback.FoundPickupsAbove();
 }
 
 
diff --git a/src/BlockEntities/HopperEntity.h b/src/BlockEntities/HopperEntity.h
index 2c8b301fe..6ef98f43a 100644
--- a/src/BlockEntities/HopperEntity.h
+++ b/src/BlockEntities/HopperEntity.h
@@ -10,7 +10,6 @@
 #pragma once
 
 #include "BlockEntityWithItems.h"
-#include "../UI/WindowOwner.h"
 
 
 
@@ -18,8 +17,7 @@
 
 // tolua_begin
 class cHopperEntity :
-	public cBlockEntityWithItems,
-	public cBlockEntityWindowOwner
+	public cBlockEntityWithItems
 {
 	typedef cBlockEntityWithItems super;
 
diff --git a/src/BlockEntities/JukeboxEntity.h b/src/BlockEntities/JukeboxEntity.h
index 996de965b..734d7bb66 100644
--- a/src/BlockEntities/JukeboxEntity.h
+++ b/src/BlockEntities/JukeboxEntity.h
@@ -43,6 +43,8 @@ public:
 	void EjectRecord(void);
 	
 	// tolua_end
+
+	static const char * GetClassStatic(void) { return "cJukeboxEntity"; }
 	
 	virtual void UsedBy(cPlayer * a_Player) override;
 	virtual void SendTo(cClientHandle &) override { };
diff --git a/src/BlockEntities/NoteEntity.h b/src/BlockEntities/NoteEntity.h
index cf78aeac6..b698899c0 100644
--- a/src/BlockEntities/NoteEntity.h
+++ b/src/BlockEntities/NoteEntity.h
@@ -54,6 +54,8 @@ public:
 	virtual void UsedBy(cPlayer * a_Player) override;
 	virtual void SendTo(cClientHandle &) override { };
 
+	static const char * GetClassStatic(void) { return "cNoteEntity"; }
+
 private:
 	char m_Pitch;
 } ;  // tolua_export
diff --git a/src/BlockEntities/SignEntity.h b/src/BlockEntities/SignEntity.h
index d998ff1e8..80c7bbfdf 100644
--- a/src/BlockEntities/SignEntity.h
+++ b/src/BlockEntities/SignEntity.h
@@ -1,4 +1,3 @@
-
 // SignEntity.h
 
 // Declares the cSignEntity class representing a single sign in the world
@@ -56,6 +55,8 @@ public:
 	
 	virtual void UsedBy(cPlayer * a_Player) override;
 	virtual void SendTo(cClientHandle & a_Client) override;
+
+	static const char * GetClassStatic(void) { return "cSignEntity"; }
 	
 private:
 
diff --git a/src/Entities/Player.cpp b/src/Entities/Player.cpp
index 286d43cf6..838bbd06c 100644
--- a/src/Entities/Player.cpp
+++ b/src/Entities/Player.cpp
@@ -1122,8 +1122,9 @@ void cPlayer::SetIP(const AString & a_IP)
 
 void cPlayer::TeleportToCoords(double a_PosX, double a_PosY, double a_PosZ)
 {
-	SetPosition( a_PosX, a_PosY, a_PosZ );
+	SetPosition(a_PosX, a_PosY, a_PosZ);
 	m_LastGroundHeight = (float)a_PosY;
+	m_LastJumpHeight = (float)a_PosY;
 
 	m_World->BroadcastTeleportEntity(*this, GetClientHandle());
 	m_ClientHandle->SendPlayerMoveLook();
diff --git a/src/ItemGrid.cpp b/src/ItemGrid.cpp
index e8b58695f..34a267bab 100644
--- a/src/ItemGrid.cpp
+++ b/src/ItemGrid.cpp
@@ -369,6 +369,13 @@ int cItemGrid::ChangeSlotCount(int a_SlotNum, int a_AddToCount)
 	}
 	
 	m_Slots[a_SlotNum].m_ItemCount += a_AddToCount;
+
+	cItemHandler * Handler = cItemHandler::GetItemHandler(m_Slots[a_SlotNum].m_ItemType);
+	if (m_Slots[a_SlotNum].m_ItemCount > Handler->GetMaxStackSize())
+	{
+		m_Slots[a_SlotNum].m_ItemCount = Handler->GetMaxStackSize();
+	}
+
 	TriggerListeners(a_SlotNum);
 	return m_Slots[a_SlotNum].m_ItemCount;
 }
diff --git a/src/Mobs/AggressiveMonster.cpp b/src/Mobs/AggressiveMonster.cpp
index f2f0c404c..0901f85a9 100644
--- a/src/Mobs/AggressiveMonster.cpp
+++ b/src/Mobs/AggressiveMonster.cpp
@@ -5,7 +5,7 @@
 
 #include "../World.h"
 #include "../Entities/Player.h"
-#include "../MersenneTwister.h"
+#include "../Tracer.h"
 
 
 
@@ -73,6 +73,18 @@ void cAggressiveMonster::Tick(float a_Dt, cChunk & a_Chunk)
 	{
 		CheckEventSeePlayer();
 	}
+
+	if (m_Target == NULL)
+		return;
+
+	cTracer LineOfSight(GetWorld());
+	Vector3d AttackDirection(m_Target->GetPosition() - GetPosition());
+
+	if (ReachedFinalDestination() && !LineOfSight.Trace(GetPosition(), AttackDirection, (int)AttackDirection.Length()))
+	{
+		// Attack if reached destination, target isn't null, and have a clear line of sight to target (so won't attack through walls)
+		Attack(a_Dt / 1000);
+	}
 }
 
 
@@ -81,7 +93,7 @@ void cAggressiveMonster::Tick(float a_Dt, cChunk & a_Chunk)
 
 void cAggressiveMonster::Attack(float a_Dt)
 {
-	super::Attack(a_Dt);
+	m_AttackInterval += a_Dt * m_AttackRate;
 
 	if ((m_Target != NULL) && (m_AttackInterval > 3.0))
 	{
diff --git a/src/Mobs/AggressiveMonster.h b/src/Mobs/AggressiveMonster.h
index 9cee4e7a7..152260f95 100644
--- a/src/Mobs/AggressiveMonster.h
+++ b/src/Mobs/AggressiveMonster.h
@@ -20,7 +20,7 @@ public:
 	virtual void InStateChasing(float a_Dt) override;
 	
 	virtual void EventSeePlayer(cEntity *) override;
-	virtual void Attack(float a_Dt) override;
+	virtual void Attack(float a_Dt);
 
 } ;
 
diff --git a/src/Mobs/Monster.cpp b/src/Mobs/Monster.cpp
index ad3a87725..9817901c9 100644
--- a/src/Mobs/Monster.cpp
+++ b/src/Mobs/Monster.cpp
@@ -311,9 +311,6 @@ void cMonster::Tick(float a_Dt, cChunk & a_Chunk)
 		}
 	}
 
-	if (ReachedFinalDestination() && (m_Target != NULL))
-		Attack(a_Dt);
-
 	SetPitchAndYawFromDestination();
 	HandleFalling();
 
@@ -657,17 +654,6 @@ void cMonster::InStateEscaping(float a_Dt)
 
 
 
-// Do attack here
-// a_Dt is passed so we can set attack rate
-void cMonster::Attack(float a_Dt)
-{
-	m_AttackInterval += a_Dt * m_AttackRate;
-}
-
-
-
-
-
 void cMonster::GetMonsterConfig(const AString & a_Name)
 {
 	cRoot::Get()->GetMonsterConfig()->AssignAttributes(this, a_Name);
diff --git a/src/Mobs/Monster.h b/src/Mobs/Monster.h
index 714feddb9..4d2e099c5 100644
--- a/src/Mobs/Monster.h
+++ b/src/Mobs/Monster.h
@@ -112,8 +112,6 @@ public:
 	virtual void InStateChasing (float a_Dt);
 	virtual void InStateEscaping(float a_Dt);
 	
-	virtual void Attack(float a_Dt);
-	
 	int GetAttackRate() { return (int)m_AttackRate; }
 	void SetAttackRate(float a_AttackRate) { m_AttackRate = a_AttackRate; }
 	void SetAttackRange(int a_AttackRange) { m_AttackRange = a_AttackRange; }
diff --git a/src/Simulator/IncrementalRedstoneSimulator.cpp b/src/Simulator/IncrementalRedstoneSimulator.cpp
index 5dba69455..a875c9e4d 100644
--- a/src/Simulator/IncrementalRedstoneSimulator.cpp
+++ b/src/Simulator/IncrementalRedstoneSimulator.cpp
@@ -960,7 +960,7 @@ void cIncrementalRedstoneSimulator::HandlePressurePlate(int a_BlockX, int a_Bloc
 					Vector3f BlockPos(m_X + 0.5f, (float)m_Y, m_Z + 0.5f);
 					float Distance = (EntityPos - BlockPos).Length();
 
-					if (Distance < 0.5)
+					if (Distance <= 0.7)
 					{
 						m_Entity = a_Entity;
 						return true; // Break out, we only need to know for wooden plates that at least one entity is on top
diff --git a/src/Simulator/IncrementalRedstoneSimulator.h b/src/Simulator/IncrementalRedstoneSimulator.h
index 3397e143c..a3da13584 100644
--- a/src/Simulator/IncrementalRedstoneSimulator.h
+++ b/src/Simulator/IncrementalRedstoneSimulator.h
@@ -207,6 +207,10 @@ private:
 			case E_BLOCK_REDSTONE_REPEATER_ON:
 			case E_BLOCK_BLOCK_OF_REDSTONE:
 			case E_BLOCK_ACTIVE_COMPARATOR:
+			case E_BLOCK_HEAVY_WEIGHTED_PRESSURE_PLATE:
+			case E_BLOCK_LIGHT_WEIGHTED_PRESSURE_PLATE:
+			case E_BLOCK_STONE_PRESSURE_PLATE:
+			case E_BLOCK_WOODEN_PRESSURE_PLATE:
 			{
 				return true;
 			}