diff --git a/src/actor.h b/src/actor.h
index 79358148fe..13425e48a4 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -529,7 +529,12 @@ struct FDropItem
 class FDropItemPtrArray : public TArray<FDropItem *>
 {
 public:
-	~FDropItemPtrArray();
+	~FDropItemPtrArray()
+	{
+		Clear();
+	}
+
+	void Clear();
 };
 
 extern FDropItemPtrArray DropItemList;
diff --git a/src/am_map.cpp b/src/am_map.cpp
index d3fbc1140b..5eb759ee3f 100644
--- a/src/am_map.cpp
+++ b/src/am_map.cpp
@@ -545,6 +545,21 @@ void AM_StaticInit()
 	}
 	markpointnum = 0;
 	mapback.SetInvalid();
+
+	static DWORD *lastpal = NULL;
+	//static int lastback = -1;
+	DWORD *palette;
+	
+	palette = (DWORD *)GPalette.BaseColors;
+
+	int i, j;
+
+	for (i = j = 0; i < 11; i++, j += 3)
+	{
+		DoomColors[i].FromRGB(DoomPaletteVals[j], DoomPaletteVals[j+1], DoomPaletteVals[j+2]);
+		StrifeColors[i].FromRGB(StrifePaletteVals[j], StrifePaletteVals[j+1], StrifePaletteVals[j+2]);
+		RavenColors[i].FromRGB(RavenPaletteVals[j], RavenPaletteVals[j+1], RavenPaletteVals[j+2]);
+	}
 }
 
 //=============================================================================
@@ -878,24 +893,6 @@ void AM_initVariables ()
 
 static void AM_initColors (bool overlayed)
 {
-	static DWORD *lastpal = NULL;
-	//static int lastback = -1;
-	DWORD *palette;
-	
-	palette = (DWORD *)GPalette.BaseColors;
-
-	if (lastpal != palette)
-	{
-		int i, j;
-
-		for (i = j = 0; i < 11; i++, j += 3)
-		{
-			DoomColors[i].FromRGB(DoomPaletteVals[j], DoomPaletteVals[j+1], DoomPaletteVals[j+2]);
-			StrifeColors[i].FromRGB(StrifePaletteVals[j], StrifePaletteVals[j+1], StrifePaletteVals[j+2]);
-			RavenColors[i].FromRGB(RavenPaletteVals[j], RavenPaletteVals[j+1], RavenPaletteVals[j+2]);
-		}
-	}
-
 	if (overlayed)
 	{
 		YourColor.FromCVar (am_ovyourcolor);
@@ -1020,8 +1017,6 @@ static void AM_initColors (bool overlayed)
 			break;
 
 	}
-
-	lastpal = palette;
 }
 
 //=============================================================================
diff --git a/src/d_main.cpp b/src/d_main.cpp
index ffe4afdbd8..2eaabf76d2 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -131,6 +131,7 @@ void D_ProcessEvents ();
 void G_BuildTiccmd (ticcmd_t* cmd);
 void D_DoAdvanceDemo ();
 void D_AddWildFile (TArray<FString> &wadfiles, const char *pattern);
+void D_LoadWadSettings ();
 
 // PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
 
@@ -1563,80 +1564,6 @@ bool ConsiderPatches (const char *arg)
 	return argc > 0;
 }
 
-//==========================================================================
-//
-// D_LoadWadSettings
-//
-// Parses any loaded KEYCONF lumps. These are restricted console scripts
-// that can only execute the alias, defaultbind, addkeysection,
-// addmenukey, weaponsection, and addslotdefault commands.
-//
-//==========================================================================
-
-void D_LoadWadSettings ()
-{
-	char cmd[4096];
-	int lump, lastlump = 0;
-
-	ParsingKeyConf = true;
-
-	while ((lump = Wads.FindLump ("KEYCONF", &lastlump)) != -1)
-	{
-		FMemLump data = Wads.ReadLump (lump);
-		const char *eof = (char *)data.GetMem() + Wads.LumpLength (lump);
-		const char *conf = (char *)data.GetMem();
-
-		while (conf < eof)
-		{
-			size_t i;
-
-			// Fetch a line to execute
-			for (i = 0; conf + i < eof && conf[i] != '\n'; ++i)
-			{
-				cmd[i] = conf[i];
-			}
-			cmd[i] = 0;
-			conf += i;
-			if (*conf == '\n')
-			{
-				conf++;
-			}
-
-			// Comments begin with //
-			char *stop = cmd + i - 1;
-			char *comment = cmd;
-			int inQuote = 0;
-
-			if (*stop == '\r')
-				*stop-- = 0;
-
-			while (comment < stop)
-			{
-				if (*comment == '\"')
-				{
-					inQuote ^= 1;
-				}
-				else if (!inQuote && *comment == '/' && *(comment + 1) == '/')
-				{
-					break;
-				}
-				comment++;
-			}
-			if (comment == cmd)
-			{ // Comment at line beginning
-				continue;
-			}
-			else if (comment < stop)
-			{ // Comment in middle of line
-				*comment = 0;
-			}
-
-			AddCommandString (cmd);
-		}
-	}
-	ParsingKeyConf = false;
-}
-
 //==========================================================================
 //
 // D_MultiExec
diff --git a/src/decallib.cpp b/src/decallib.cpp
index 072262da9c..6bbf0f74da 100644
--- a/src/decallib.cpp
+++ b/src/decallib.cpp
@@ -353,6 +353,7 @@ void FDecalLib::ReadAllDecals ()
 	}
 	Animators.Clear();
 	FDecalCombinerAnim::AnimatorList.Clear();
+	DecalTranslations.Clear();
 
 	DecalLibrary.Clear();
 
diff --git a/src/g_mapinfo.cpp b/src/g_mapinfo.cpp
index bc1a19d48d..4199305d3f 100644
--- a/src/g_mapinfo.cpp
+++ b/src/g_mapinfo.cpp
@@ -1809,6 +1809,7 @@ static void ClearMapinfo()
 	AllSkills.Clear();
 	DefaultSkill = -1;
 	DeinitIntermissions();
+	level.info = NULL;
 }
 
 //==========================================================================
diff --git a/src/gi.cpp b/src/gi.cpp
index 705f9b8019..0e010724a8 100644
--- a/src/gi.cpp
+++ b/src/gi.cpp
@@ -77,7 +77,7 @@ static gameborder_t StrifeBorder =
 
 // Custom GAMEINFO ------------------------------------------------------------
 
-const char* GameInfoBoarders[] =
+const char* GameInfoBorders[] =
 {
 	"DoomBorder",
 	"HereticBorder",
@@ -219,7 +219,7 @@ void FMapInfoParser::ParseGameInfo()
 		{
 			if(sc.CheckToken(TK_Identifier))
 			{
-				switch(sc.MustMatchString(GameInfoBoarders))
+				switch(sc.MustMatchString(GameInfoBorders))
 				{
 					default:
 						gameinfo.border = &DoomBorder;
diff --git a/src/info.cpp b/src/info.cpp
index f345a6e7f8..32aa92a915 100644
--- a/src/info.cpp
+++ b/src/info.cpp
@@ -53,6 +53,7 @@
 
 extern void LoadActors ();
 extern void InitBotStuff();
+extern void ClearStrifeTypes();
 
 
 //==========================================================================
@@ -122,6 +123,7 @@ void FActorInfo::StaticInit ()
 	}
 
 	Printf ("LoadActors: Load actor definitions.\n");
+	ClearStrifeTypes();
 	LoadActors ();
 	InitBotStuff();
 }
diff --git a/src/keysections.cpp b/src/keysections.cpp
index 6ef0538f6e..bfec4060e3 100644
--- a/src/keysections.cpp
+++ b/src/keysections.cpp
@@ -41,6 +41,7 @@
 #include "c_bind.h"
 #include "c_dispatch.h"
 #include "gameconfigfile.h"
+#include "w_wad.h"
 
 TArray<FKeySection> KeySections;
 
@@ -141,3 +142,78 @@ CCMD (addmenukey)
 	}
 }
 
+//==========================================================================
+//
+// D_LoadWadSettings
+//
+// Parses any loaded KEYCONF lumps. These are restricted console scripts
+// that can only execute the alias, defaultbind, addkeysection,
+// addmenukey, weaponsection, and addslotdefault commands.
+//
+//==========================================================================
+
+void D_LoadWadSettings ()
+{
+	char cmd[4096];
+	int lump, lastlump = 0;
+
+	ParsingKeyConf = true;
+	KeySections.Clear();
+
+	while ((lump = Wads.FindLump ("KEYCONF", &lastlump)) != -1)
+	{
+		FMemLump data = Wads.ReadLump (lump);
+		const char *eof = (char *)data.GetMem() + Wads.LumpLength (lump);
+		const char *conf = (char *)data.GetMem();
+
+		while (conf < eof)
+		{
+			size_t i;
+
+			// Fetch a line to execute
+			for (i = 0; conf + i < eof && conf[i] != '\n'; ++i)
+			{
+				cmd[i] = conf[i];
+			}
+			cmd[i] = 0;
+			conf += i;
+			if (*conf == '\n')
+			{
+				conf++;
+			}
+
+			// Comments begin with //
+			char *stop = cmd + i - 1;
+			char *comment = cmd;
+			int inQuote = 0;
+
+			if (*stop == '\r')
+				*stop-- = 0;
+
+			while (comment < stop)
+			{
+				if (*comment == '\"')
+				{
+					inQuote ^= 1;
+				}
+				else if (!inQuote && *comment == '/' && *(comment + 1) == '/')
+				{
+					break;
+				}
+				comment++;
+			}
+			if (comment == cmd)
+			{ // Comment at line beginning
+				continue;
+			}
+			else if (comment < stop)
+			{ // Comment in middle of line
+				*comment = 0;
+			}
+
+			AddCommandString (cmd);
+		}
+	}
+	ParsingKeyConf = false;
+}
+
diff --git a/src/menu/menu.cpp b/src/menu/menu.cpp
index 0bdc622fce..c8728515b1 100644
--- a/src/menu/menu.cpp
+++ b/src/menu/menu.cpp
@@ -70,7 +70,6 @@ CVAR(Int, m_show_backbutton, 0, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
 DMenu *DMenu::CurrentMenu;
 int DMenu::MenuTime;
 
-FListMenuDescriptor *MainMenu;
 FGameStartup GameStartupInfo;
 EMenuState		menuactive;
 bool			M_DemoNoPlay;
diff --git a/src/p_conversation.cpp b/src/p_conversation.cpp
index 9b1119e0dd..39da6b65a3 100644
--- a/src/p_conversation.cpp
+++ b/src/p_conversation.cpp
@@ -145,6 +145,11 @@ void SetStrifeType(int convid, const PClass *Class)
 	StrifeTypes[convid] = Class;
 }
 
+void ClearStrifeTypes()
+{
+	StrifeTypes.Clear();
+}
+
 void SetConversation(int convid, const PClass *Class, int dlgindex)
 {
 	if (convid != -1)
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index bc173b9cb0..0b13c8c759 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -5586,12 +5586,13 @@ void FreeDropItemChain(FDropItem *chain)
 	}
 }
 
-FDropItemPtrArray::~FDropItemPtrArray()
+void FDropItemPtrArray::Clear()
 {
 	for (unsigned int i = 0; i < Size(); ++i)
 	{
 		FreeDropItemChain ((*this)[i]);
 	}
+	TArray<FDropItem *>::Clear();
 }
 
 int StoreDropItemChain(FDropItem *chain)
diff --git a/src/p_setup.cpp b/src/p_setup.cpp
index 7017d5c8b9..4dec4a95c7 100644
--- a/src/p_setup.cpp
+++ b/src/p_setup.cpp
@@ -3491,6 +3491,7 @@ void P_FreeExtraLevelData()
 			delete node;
 			node = next;
 		}
+		FBlockNode::FreeBlocks = NULL;
 	}
 	{
 		msecnode_t *node = headsecnode;
@@ -3528,8 +3529,11 @@ void P_SetupLevel (char *lumpname, int position)
 
 	wminfo.partime = 180;
 
+	MapThingsConverted.Clear();
+	linemap.Clear();
 	FCanvasTextureInfo::EmptyList ();
 	R_FreePastViewers ();
+	P_ClearUDMFKeys();
 
 	if (!savegamerestore)
 	{
diff --git a/src/p_states.cpp b/src/p_states.cpp
index 15ff371174..21dd1537de 100644
--- a/src/p_states.cpp
+++ b/src/p_states.cpp
@@ -861,7 +861,6 @@ bool FStateDefinitions::AddStates(FState *state, const char *framechars)
 
 int FStateDefinitions::FinishStates (FActorInfo *actor, AActor *defaults)
 {
-	static int c=0;
 	int count = StateArray.Size();
 
 	if (count > 0)
diff --git a/src/p_terrain.cpp b/src/p_terrain.cpp
index 14d2bb3df0..c3df86b274 100644
--- a/src/p_terrain.cpp
+++ b/src/p_terrain.cpp
@@ -242,6 +242,8 @@ void P_InitTerrainTypes ()
 	int lump;
 	int size;
 
+	Splashes.Clear();
+	Terrains.Clear();
 	size = (TexMan.NumTextures()+1);
 	TerrainTypes.Resize(size);
 	TerrainTypes.Clear();
diff --git a/src/r_things.cpp b/src/r_things.cpp
index 4d40c04cd6..6fa357434c 100644
--- a/src/r_things.cpp
+++ b/src/r_things.cpp
@@ -2357,6 +2357,7 @@ void R_InitParticles ()
 	if ( NumParticles < 100 )
 		NumParticles = 100;
 
+	R_DeinitParticles();
 	Particles = new particle_t[NumParticles];
 	R_ClearParticles ();
 	atterm (R_DeinitParticles);
diff --git a/src/s_advsound.cpp b/src/s_advsound.cpp
index 32c2f3222f..3245c20fa1 100644
--- a/src/s_advsound.cpp
+++ b/src/s_advsound.cpp
@@ -857,6 +857,8 @@ static void S_ClearSoundData()
 	PlayerSounds.Clear();
 	DefPlayerClass = 0;
 	DefPlayerClassName = "";
+	MusicAliases.Clear();
+	MidiDevices.Clear();
 }
 
 //==========================================================================
@@ -867,10 +869,11 @@ static void S_ClearSoundData()
 // Also registers Blood SFX files and Strife's voices.
 //==========================================================================
 
-void S_ParseSndInfo ()
+void S_ParseSndInfo (bool redefine)
 {
 	int lump;
 
+	if (!redefine) SavedPlayerSounds.Clear();	// clear skin sounds only for initial parsing.
 	atterm (S_ClearSoundData);
 	S_ClearSoundData();	// remove old sound data first!
 
diff --git a/src/s_sound.cpp b/src/s_sound.cpp
index bb85541c49..c09e913be8 100644
--- a/src/s_sound.cpp
+++ b/src/s_sound.cpp
@@ -322,7 +322,7 @@ void S_Init ()
 void S_InitData ()
 {
 	LastLocalSndInfo = LastLocalSndSeq = "";
-	S_ParseSndInfo ();
+	S_ParseSndInfo (false);
 	S_ParseSndSeq (-1);
 	S_ParseMusInfo();
 }
@@ -408,7 +408,7 @@ void S_Start ()
 			}
 			
 			// Parse the global SNDINFO
-			S_ParseSndInfo();
+			S_ParseSndInfo(true);
 		
 			if (*LocalSndInfo)
 			{
diff --git a/src/s_sound.h b/src/s_sound.h
index ee831bddfa..12e7ee3c65 100644
--- a/src/s_sound.h
+++ b/src/s_sound.h
@@ -331,7 +331,7 @@ void S_UpdateSounds (AActor *listener);
 void S_RestoreEvictedChannels();
 
 // [RH] S_sfx "maintenance" routines
-void S_ParseSndInfo ();
+void S_ParseSndInfo (bool redefine);
 void S_ParseReverbDef ();
 void S_UnloadReverbDef ();
 
diff --git a/src/statistics.cpp b/src/statistics.cpp
index 276090ebd3..9c07ac6da1 100644
--- a/src/statistics.cpp
+++ b/src/statistics.cpp
@@ -134,6 +134,7 @@ static void ParseStatistics(const char *fn, TArray<FStatistics> &statlist)
 	{
 		FScanner sc;
 		sc.OpenFile(fn);
+		statlist.Clear();
 
 		while (sc.GetString())
 		{
diff --git a/src/teaminfo.cpp b/src/teaminfo.cpp
index c54b2f9d6b..f5c3c35e20 100644
--- a/src/teaminfo.cpp
+++ b/src/teaminfo.cpp
@@ -131,6 +131,7 @@ void FTeam::ParseTeamInfo ()
 {
 	int iLump, iLastLump = 0;
 
+	Teams.Clear();
 	while ((iLump = Wads.FindLump ("TEAMINFO", &iLastLump)) != -1)
 	{
 		FScanner Scan (iLump);
diff --git a/src/textures/anim_switches.cpp b/src/textures/anim_switches.cpp
index b065f0b96e..014e879f87 100644
--- a/src/textures/anim_switches.cpp
+++ b/src/textures/anim_switches.cpp
@@ -317,7 +317,7 @@ void FTextureManager::AddSwitchPair (FSwitchDef *def1, FSwitchDef *def2)
 	unsigned int i;
 	FSwitchDef *sw1 = NULL;
 	FSwitchDef *sw2 = NULL;
-	unsigned int index1 = -1, index2 = -1;
+	unsigned int index1 = 0xffffffff, index2 = 0xffffffff;
 
 	for (i = mSwitchDefs.Size (); i-- > 0; )
 	{
@@ -325,13 +325,13 @@ void FTextureManager::AddSwitchPair (FSwitchDef *def1, FSwitchDef *def2)
 		{
 			index1 = i;
 			sw1 = mSwitchDefs[index1];
-			if (index2 != -1u) break;
+			if (index2 != 0xffffffff) break;
 		}
 		if (mSwitchDefs[i]->PreTexture == def2->PreTexture)
 		{
 			index2 = i;
 			sw2 = mSwitchDefs[index2];
-			if (index1 != -1u) break;
+			if (index1 != 0xffffffff) break;
 		}
 	}
 
diff --git a/src/thingdef/thingdef.cpp b/src/thingdef/thingdef.cpp
index 6362c62fe8..1b2f844bd9 100644
--- a/src/thingdef/thingdef.cpp
+++ b/src/thingdef/thingdef.cpp
@@ -337,6 +337,7 @@ void LoadActors ()
 {
 	int lastlump, lump;
 
+	DropItemList.Clear();
 	FScriptPosition::ResetErrorCounter();
 	InitThingdef();
 	lastlump = 0;
diff --git a/src/thingdef/thingdef_data.cpp b/src/thingdef/thingdef_data.cpp
index 54de97aa86..30c35a0a40 100644
--- a/src/thingdef/thingdef_data.cpp
+++ b/src/thingdef/thingdef_data.cpp
@@ -584,6 +584,7 @@ void InitThingdef()
 	}
 
 	// Create a sorted list of properties
+	if (properties.Size() == 0)
 	{
 		FAutoSegIterator probe(GRegHead, GRegTail);
 
@@ -596,6 +597,7 @@ void InitThingdef()
 	}
 
 	// Create a sorted list of native action functions
+	if (AFTable.Size() == 0)
 	{
 		FAutoSegIterator probe(ARegHead, ARegTail);
 
@@ -608,6 +610,7 @@ void InitThingdef()
 	}
 
 	// Create a sorted list of native variables
+	if (variables.Size() == 0)
 	{
 		FAutoSegIterator probe(MRegHead, MRegTail);