diff --git a/Minecraft.Client/Common/Network/NetworkSocketLayer.cpp b/Minecraft.Client/Common/Network/NetworkSocketLayer.cpp
index b76c5716..9536e272 100644
--- a/Minecraft.Client/Common/Network/NetworkSocketLayer.cpp
+++ b/Minecraft.Client/Common/Network/NetworkSocketLayer.cpp
@@ -143,7 +143,9 @@ bool NetworkSocketLayer::Initialize()
 
 	s_initialized = true;
 
+#ifndef _DEDICATED_SERVER
 	StartDiscovery();
+#endif
 
 	return true;
 }
diff --git a/Minecraft.Client/MinecraftServer.cpp b/Minecraft.Client/MinecraftServer.cpp
index eae6c64a..67f5e027 100644
--- a/Minecraft.Client/MinecraftServer.cpp
+++ b/Minecraft.Client/MinecraftServer.cpp
@@ -1634,6 +1634,33 @@ void MinecraftServer::tick()
 
 	tickCount++;
 
+#ifdef _DEDICATED_SERVER
+	if (tickCount % 6000 == 0 && !s_bServerHalted)
+	{
+		app.DebugPrintf("Auto-saving world...\n");
+		if (players != NULL)
+		{
+			players->saveAll(NULL);
+		}
+		for (unsigned int j = 0; j < levels.length; j++)
+		{
+			if (s_bServerHalted) break;
+			ServerLevel *level = levels[levels.length - 1 - j];
+			if (level) level->save(false, NULL, true);
+		}
+		if (!s_bServerHalted)
+		{
+			saveGameRules();
+			levels[0]->saveToDisc(NULL, true);
+		}
+		while (StorageManager.GetSaveState() != C4JStorage::ESaveGame_Idle)
+		{
+			Sleep(10);
+		}
+		app.DebugPrintf("Auto-save complete\n");
+	}
+#endif
+
 	// 4J We need to update client difficulty levels based on the servers
 	Minecraft *pMinecraft = Minecraft::GetInstance();
 	// 4J-PB - sending this on the host changing the difficulty in the menus
diff --git a/Minecraft.Client/MultiPlayerChunkCache.cpp b/Minecraft.Client/MultiPlayerChunkCache.cpp
index 46c2a8d7..879ebfd9 100644
--- a/Minecraft.Client/MultiPlayerChunkCache.cpp
+++ b/Minecraft.Client/MultiPlayerChunkCache.cpp
@@ -175,10 +175,11 @@ LevelChunk *MultiPlayerChunkCache::create(int x, int z)
 			if (MinecraftServer::getInstance()->serverHalted()) return NULL;
 
 			// If we're the host, then don't create the chunk, share data from the server's copy 
+			int dimId = level->dimension->id;
 #ifdef _LARGE_WORLDS
-			LevelChunk *serverChunk = MinecraftServer::getInstance()->getLevel(level->dimension->id)->cache->getChunkLoadedOrUnloaded(x,z);
+			LevelChunk *serverChunk = MinecraftServer::getInstance()->getLevel(dimId)->cache->getChunkLoadedOrUnloaded(x,z);
 #else
-			LevelChunk *serverChunk = MinecraftServer::getInstance()->getLevel(level->dimension->id)->cache->getChunk(x,z);
+			LevelChunk *serverChunk = MinecraftServer::getInstance()->getLevel(dimId)->cache->getChunk(x,z);
 #endif
 			chunk = new LevelChunk(level, x, z, serverChunk);
 			// Let renderer know that this chunk has been created - it might have made render data from the EmptyChunk if it got to a chunk before the server sent it
diff --git a/Minecraft.Client/ServerChunkCache.cpp b/Minecraft.Client/ServerChunkCache.cpp
index f26489e8..c8f84836 100644
--- a/Minecraft.Client/ServerChunkCache.cpp
+++ b/Minecraft.Client/ServerChunkCache.cpp
@@ -151,8 +151,10 @@ LevelChunk *ServerChunkCache::create(int x, int z, bool asyncPostProcess)	// 4J
 
 	if( ( chunk == NULL ) || ( chunk->x != x ) || ( chunk->z != z ) )
 	{
+		bool wasLoaded = false;
 		EnterCriticalSection(&m_csLoadCreate);
         chunk = load(x, z);
+		wasLoaded = (chunk != NULL);
         if (chunk == NULL)
 		{
             if (source == NULL)
diff --git a/Minecraft.World/OldChunkStorage.cpp b/Minecraft.World/OldChunkStorage.cpp
index bb87e39d..7dbd4a86 100644
--- a/Minecraft.World/OldChunkStorage.cpp
+++ b/Minecraft.World/OldChunkStorage.cpp
@@ -476,29 +476,28 @@ LevelChunk *OldChunkStorage::load(Level *level, DataInputStream *dis)
 
 	CompoundTag *tag = NbtIo::read(dis);
 
-	loadEntities(levelChunk, level, tag);
-
-	if (tag->contains(L"TileTicks"))
+	if (tag != NULL)
 	{
-		PIXBeginNamedEvent(0,"Loading TileTicks");
-		ListTag<CompoundTag> *tileTicks = (ListTag<CompoundTag> *) tag->getList(L"TileTicks");
+		loadEntities(levelChunk, level, tag);
 
-		if (tileTicks != NULL)
+		if (tag->contains(L"TileTicks"))
 		{
-			for (int i = 0; i < tileTicks->size(); i++)
-			{
-				CompoundTag *teTag = tileTicks->get(i);
+			ListTag<CompoundTag> *tileTicks = (ListTag<CompoundTag> *) tag->getList(L"TileTicks");
 
-				level->forceAddTileTick(teTag->getInt(L"x"), teTag->getInt(L"y"), teTag->getInt(L"z"), teTag->getInt(L"i"), teTag->getInt(L"t"), teTag->getInt(L"p"));
+			if (tileTicks != NULL)
+			{
+				for (int i = 0; i < tileTicks->size(); i++)
+				{
+					CompoundTag *teTag = tileTicks->get(i);
+
+					level->forceAddTileTick(teTag->getInt(L"x"), teTag->getInt(L"y"), teTag->getInt(L"z"), teTag->getInt(L"i"), teTag->getInt(L"t"));
+				}
 			}
 		}
-		PIXEndNamedEvent();
+
+		delete tag;
 	}
 
-	delete tag;
-
-	PIXEndNamedEvent();
-
 	return levelChunk;
 }
 
diff --git a/Minecraft.World/RandomLevelSource.cpp b/Minecraft.World/RandomLevelSource.cpp
index 9c24e4b3..51954be9 100644
--- a/Minecraft.World/RandomLevelSource.cpp
+++ b/Minecraft.World/RandomLevelSource.cpp
@@ -778,7 +778,7 @@ void RandomLevelSource::postProcess(ChunkSource *parent, int xt, int zt)
 		mineShaftFeature->postProcess(level, pprandom, xt, zt);
 		hasVillage = villageFeature->postProcess(level, pprandom, xt, zt);
 		strongholdFeature->postProcess(level, pprandom, xt, zt);
-		scatteredFeature->postProcess(level, random, xt, zt);
+		scatteredFeature->postProcess(level, pprandom, xt, zt);
 	}
 	PIXEndNamedEvent();
 
diff --git a/Minecraft.World/RegionFile.cpp b/Minecraft.World/RegionFile.cpp
index 305337a8..de920fa9 100644
--- a/Minecraft.World/RegionFile.cpp
+++ b/Minecraft.World/RegionFile.cpp
@@ -38,7 +38,12 @@ RegionFile::RegionFile(ConsoleSaveFile *saveFile, File *path)
 	}
 	*/
 
-	fileEntry = m_saveFile->createFile( fileName->getName() );
+	wstring saveName = fileName->getPath();
+	for (size_t i = 0; i < saveName.size(); i++)
+	{
+		if (saveName[i] == L'\\') saveName[i] = L'/';
+	}
+	fileEntry = m_saveFile->createFile( ConsoleSavePath(saveName) );
 	m_saveFile->setFilePointer( fileEntry, 0, NULL, FILE_END );
 
 	if ( fileEntry->getFileSize() < SECTOR_BYTES)
diff --git a/Minecraft.World/RegionFileCache.cpp b/Minecraft.World/RegionFileCache.cpp
index 6b88f4e0..3b84f773 100644
--- a/Minecraft.World/RegionFileCache.cpp
+++ b/Minecraft.World/RegionFileCache.cpp
@@ -17,7 +17,7 @@ bool RegionFileCache::useSplitSaves(ESavePlatform platform)
 	};
 }
 
-RegionFile *RegionFileCache::_getRegionFile(ConsoleSaveFile *saveFile, const wstring &prefix, int chunkX, int chunkZ)		// 4J - TODO was synchronized
+RegionFile *RegionFileCache::_getRegionFile(ConsoleSaveFile *saveFile, const wstring &prefix, int chunkX, int chunkZ)		// 4J - synchronized restored
 {
 	// 4J Jev - changed back to use of the File class.
 	//char file[MAX_PATH_SIZE];
@@ -26,6 +26,7 @@ RegionFile *RegionFileCache::_getRegionFile(ConsoleSaveFile *saveFile, const wst
 	//File regionDir(basePath, L"region");
 
 	//File file(regionDir, wstring(L"r.") + _toString(chunkX>>5) + L"." + _toString(chunkZ>>5) + L".mcr" );
+	EnterCriticalSection(&m_cs);
 	MemSect(31);
 	File file;
 	if(useSplitSaves(saveFile->getSavePlatform()))
@@ -46,6 +47,7 @@ RegionFile *RegionFileCache::_getRegionFile(ConsoleSaveFile *saveFile, const wst
 	// 4J Jev, put back in.
     if (ref != NULL)
 	{
+		LeaveCriticalSection(&m_cs);
 		return ref;
     }
 
@@ -63,12 +65,14 @@ RegionFile *RegionFileCache::_getRegionFile(ConsoleSaveFile *saveFile, const wst
 
 	RegionFile *reg = new RegionFile(saveFile, &file);
     cache[file] = reg;	   // 4J - this was originally a softReferenc
+	LeaveCriticalSection(&m_cs);
     return reg;
 
 }
 
 void RegionFileCache::_clear()															// 4J - TODO was synchronized
 {
+	EnterCriticalSection(&m_cs);
 	AUTO_VAR(itEnd, cache.end());
 	for( AUTO_VAR(it, cache.begin()); it != itEnd; it++ )
 	{
@@ -85,6 +89,7 @@ void RegionFileCache::_clear()															// 4J - TODO was synchronized
 //        }	
 	}
 	cache.clear();
+	LeaveCriticalSection(&m_cs);
 }
 
 int RegionFileCache::_getSizeDelta(ConsoleSaveFile *saveFile, const wstring &prefix, int chunkX, int chunkZ)
@@ -120,9 +125,3 @@ DataOutputStream *RegionFileCache::_getChunkDataOutputStream(ConsoleSaveFile *sa
 		return r->getChunkDataOutputStream(chunkX & 31, chunkZ & 31);
 	}
 }
-
-
-RegionFileCache::~RegionFileCache()
-{
-	_clear();
-}
diff --git a/Minecraft.World/RegionFileCache.h b/Minecraft.World/RegionFileCache.h
index 822e49c9..58af1f03 100644
--- a/Minecraft.World/RegionFileCache.h
+++ b/Minecraft.World/RegionFileCache.h
@@ -10,13 +10,14 @@ private:
 	static const int MAX_CACHE_SIZE = 256;
 
 	unordered_map<File, RegionFile *, FileKeyHash, FileKeyEq> cache;
+	CRITICAL_SECTION m_cs;
 
 	static RegionFileCache s_defaultCache;
 
 public:
 	// Made public and non-static so we can have a cache for input and output files
-	RegionFileCache() {}
-	~RegionFileCache();
+	RegionFileCache() { InitializeCriticalSectionAndSpinCount(&m_cs, 4000); }
+	~RegionFileCache() { DeleteCriticalSection(&m_cs); _clear(); }
 
     RegionFile *_getRegionFile(ConsoleSaveFile *saveFile, const wstring &prefix, int chunkX, int chunkZ);		// 4J - TODO was synchronized
     void _clear();															// 4J - TODO was synchronized
diff --git a/Minecraft.World/SparseDataStorage.cpp b/Minecraft.World/SparseDataStorage.cpp
index dc32a431..0e460214 100644
--- a/Minecraft.World/SparseDataStorage.cpp
+++ b/Minecraft.World/SparseDataStorage.cpp
@@ -602,9 +602,10 @@ bool SparseDataStorage::isCompressed()
 
 void SparseDataStorage::write(DataOutputStream *dos)
 {
-	int count = ( dataAndCount >> 48 ) & 0xffff;
+	__int64 snapshot = dataAndCount;
+	int count = ( snapshot >> 48 ) & 0xffff;
 	dos->writeInt(count);
-	unsigned char *dataPointer = (unsigned char *)(dataAndCount & 0x0000ffffffffffff);
+	unsigned char *dataPointer = (unsigned char *)(snapshot & 0x0000ffffffffffff);
 	byteArray wrapper(dataPointer, count * 128 + 128);
 	dos->write(wrapper);
 }
diff --git a/Minecraft.World/SparseLightStorage.cpp b/Minecraft.World/SparseLightStorage.cpp
index 8b848520..7257f29d 100644
--- a/Minecraft.World/SparseLightStorage.cpp
+++ b/Minecraft.World/SparseLightStorage.cpp
@@ -619,9 +619,10 @@ bool SparseLightStorage::isCompressed()
 
 void SparseLightStorage::write(DataOutputStream *dos)
 {
-	int count = ( dataAndCount >> 48 ) & 0xffff;
+	__int64 snapshot = dataAndCount;
+	int count = ( snapshot >> 48 ) & 0xffff;
 	dos->writeInt(count);
-	unsigned char *dataPointer = (unsigned char *)(dataAndCount & 0x0000ffffffffffff);
+	unsigned char *dataPointer = (unsigned char *)(snapshot & 0x0000ffffffffffff);
 	byteArray wrapper(dataPointer, count * 128 + 128);
 	dos->write(wrapper);
 }
diff --git a/Minecraft.World/StructureFeature.cpp b/Minecraft.World/StructureFeature.cpp
index ab4e37db..ba10ceec 100644
--- a/Minecraft.World/StructureFeature.cpp
+++ b/Minecraft.World/StructureFeature.cpp
@@ -9,6 +9,7 @@
 
 StructureFeature::StructureFeature()
 {
+	InitializeCriticalSectionAndSpinCount(&m_csCachedStructures, 4000);
 #ifdef ENABLE_STRUCTURE_SAVING
 	savedData = nullptr;
 #endif
@@ -16,10 +17,13 @@ StructureFeature::StructureFeature()
 
 StructureFeature::~StructureFeature()
 {
+	EnterCriticalSection(&m_csCachedStructures);
 	for( AUTO_VAR(it, cachedStructures.begin()); it != cachedStructures.end(); it++ )
 	{
 		delete it->second;
 	}
+	LeaveCriticalSection(&m_csCachedStructures);
+	DeleteCriticalSection(&m_csCachedStructures);
 }
 
 void StructureFeature::addFeature(Level *level, int x, int z, int xOffs, int zOffs, byteArray blocks)
@@ -28,12 +32,16 @@ void StructureFeature::addFeature(Level *level, int x, int z, int xOffs, int zOf
 	// the chunk being generated, but not all chunks are the sources of
 	// structures
 
+	EnterCriticalSection(&m_csCachedStructures);
+
 	restoreSavedData(level);
 
 	if (cachedStructures.find(ChunkPos::hashCode(x, z)) != cachedStructures.end())
 	{
+		LeaveCriticalSection(&m_csCachedStructures);
 		return;
 	}
+	LeaveCriticalSection(&m_csCachedStructures);
 
 	// clear random key
 	random->nextInt();
@@ -41,7 +49,9 @@ void StructureFeature::addFeature(Level *level, int x, int z, int xOffs, int zOf
 	if (isFeatureChunk(x, z,level->getLevelData()->getGenerator() == LevelType::lvl_flat))
 	{
 		StructureStart *start = createStructureStart(x, z);
+		EnterCriticalSection(&m_csCachedStructures);
 		cachedStructures[ChunkPos::hashCode(x, z)] = start;
+		LeaveCriticalSection(&m_csCachedStructures);
 		saveFeature(x, z, start);
 	}
 }
@@ -58,6 +68,7 @@ bool StructureFeature::postProcess(Level *level, Random *random, int chunkX, int
 	int cz = (chunkZ << 4); // + 8;
 
 	bool intersection = false;
+	EnterCriticalSection(&m_csCachedStructures);
 	for( AUTO_VAR(it, cachedStructures.begin()); it != cachedStructures.end(); it++ )
 	{
 		StructureStart *structureStart = it->second;
@@ -76,12 +87,14 @@ bool StructureFeature::postProcess(Level *level, Random *random, int chunkX, int
 			}
 		}
 	}
+	LeaveCriticalSection(&m_csCachedStructures);
 
 	return intersection;
 }
 
 bool StructureFeature::isIntersection(int cellX, int cellZ)
 {
+	EnterCriticalSection(&m_csCachedStructures);
 	restoreSavedData(level);
 
 	for( AUTO_VAR(it, cachedStructures.begin()); it != cachedStructures.end(); it++ )
@@ -97,12 +110,14 @@ bool StructureFeature::isIntersection(int cellX, int cellZ)
 					StructurePiece *next = *it2++;
 					if (next->getBoundingBox()->intersects(cellX, cellZ, cellX, cellZ))
 					{
+						LeaveCriticalSection(&m_csCachedStructures);
 						return true;
 					}
 				}
 			}
 		}
 	}
+	LeaveCriticalSection(&m_csCachedStructures);
 	return false;
 }
 
@@ -114,6 +129,7 @@ bool StructureFeature::isInsideFeature(int cellX, int cellY, int cellZ)
 
 StructureStart *StructureFeature::getStructureAt(int cellX, int cellY, int cellZ)
 {
+	EnterCriticalSection(&m_csCachedStructures);
 	//for (StructureStart structureStart : cachedStructures.values()) 
 	for(AUTO_VAR(it, cachedStructures.begin()); it != cachedStructures.end(); ++it)
 	{
@@ -138,12 +154,14 @@ StructureStart *StructureFeature::getStructureAt(int cellX, int cellY, int cellZ
 					StructurePiece* piece = *it2;
 					if ( piece->getBoundingBox()->isInside(cellX, cellY, cellZ)  )
 					{
+						LeaveCriticalSection(&m_csCachedStructures);
 						return pStructureStart;
 					}
 				}
 			}
 		}
 	}
+	LeaveCriticalSection(&m_csCachedStructures);
 	return NULL;
 }
 
@@ -151,14 +169,17 @@ bool StructureFeature::isInsideBoundingFeature(int cellX, int cellY, int cellZ)
 {
 	restoreSavedData(level);
 
+	EnterCriticalSection(&m_csCachedStructures);
 	for(AUTO_VAR(it, cachedStructures.begin()); it != cachedStructures.end(); ++it)
 	{
 		StructureStart *structureStart = it->second;
 		if (structureStart->isValid())
 		{
+			LeaveCriticalSection(&m_csCachedStructures);
 			return (structureStart->getBoundingBox()->intersects(cellX, cellZ, cellX, cellZ));
 		}
 	}
+	LeaveCriticalSection(&m_csCachedStructures);
 	return false;
 }
 
@@ -182,6 +203,7 @@ TilePos *StructureFeature::getNearestGeneratedFeature(Level *level, int cellX, i
 	double minDistance = DBL_MAX;
 	TilePos *selected = NULL;
 
+	EnterCriticalSection(&m_csCachedStructures);
 	for(AUTO_VAR(it, cachedStructures.begin()); it != cachedStructures.end(); ++it)
 	{
 		StructureStart *pStructureStart = it->second;
@@ -205,6 +227,7 @@ TilePos *StructureFeature::getNearestGeneratedFeature(Level *level, int cellX, i
 			}
 		}
 	}
+	LeaveCriticalSection(&m_csCachedStructures);
 	if (selected != NULL) 
 	{
 		return selected;
diff --git a/Minecraft.World/StructureFeature.h b/Minecraft.World/StructureFeature.h
index 5159343a..16e246cb 100644
--- a/Minecraft.World/StructureFeature.h
+++ b/Minecraft.World/StructureFeature.h
@@ -27,6 +27,7 @@ private:
 
 protected:
 	unordered_map<__int64, StructureStart *> cachedStructures;
+	CRITICAL_SECTION m_csCachedStructures;
 
 public:
 	StructureFeature();