diff --git a/src/d_dehacked.cpp b/src/d_dehacked.cpp
index 49e82117..4239ae3d 100644
--- a/src/d_dehacked.cpp
+++ b/src/d_dehacked.cpp
@@ -1353,7 +1353,7 @@ static int PatchFrame (int frameNum)
 
 		if (keylen == 8 && stricmp (Line1, "Duration") == 0)
 		{
-			tics = clamp (val, -1, 65534);
+			tics = clamp (val, -1, SHRT_MAX);
 		}
 		else if (keylen == 9 && stricmp (Line1, "Unknown 1") == 0)
 		{
diff --git a/src/g_level.cpp b/src/g_level.cpp
index e6b8bad9..32acf14c 100644
--- a/src/g_level.cpp
+++ b/src/g_level.cpp
@@ -737,7 +737,14 @@ void G_DoCompleted (void)
 
 	if (mode == FINISH_SameHub)
 	{ // Remember the level's state for re-entry.
-		G_SnapshotLevel ();
+		if (!(level.flags2 & LEVEL2_FORGETSTATE))
+		{
+			G_SnapshotLevel ();
+		}
+		else
+		{ // Make sure we don't have a snapshot lying around from before.
+			level.info->ClearSnapshot();
+		}
 	}
 	else
 	{ // Forget the states of all existing levels.
diff --git a/src/g_level.h b/src/g_level.h
index c246e5b7..488cb3ea 100644
--- a/src/g_level.h
+++ b/src/g_level.h
@@ -213,6 +213,7 @@ enum ELevelFlags
 	LEVEL2_NOSTATISTICS			= 0x10000000,	// This level should not have statistics collected
 	LEVEL2_ENDGAME				= 0x20000000,	// This is an epilogue level that cannot be quit.
 	LEVEL2_NOAUTOSAVEHINT		= 0x40000000,	// tell the game that an autosave for this level does not need to be kept
+	LEVEL2_FORGETSTATE			= 0x80000000,	// forget this map's state in a hub
 };
 
 
diff --git a/src/g_mapinfo.cpp b/src/g_mapinfo.cpp
index 1d229267..4614afd3 100644
--- a/src/g_mapinfo.cpp
+++ b/src/g_mapinfo.cpp
@@ -1264,6 +1264,8 @@ MapFlagHandlers[] =
 	{ "endofgame",						MITYPE_SETFLAG2,	LEVEL2_ENDGAME, 0 },
 	{ "nostatistics",					MITYPE_SETFLAG2,	LEVEL2_NOSTATISTICS, 0 },
 	{ "noautosavehint",					MITYPE_SETFLAG2,	LEVEL2_NOAUTOSAVEHINT, 0 },
+	{ "forgetstate",					MITYPE_SETFLAG2,	LEVEL2_FORGETSTATE, 0 },
+	{ "rememberstate",					MITYPE_CLRFLAG2,	LEVEL2_FORGETSTATE, 0 },
 	{ "unfreezesingleplayerconversations",MITYPE_SETFLAG2,	LEVEL2_CONV_SINGLE_UNFREEZE, 0 },
 	{ "nobotnodes",						MITYPE_IGNORE,	0, 0 },		// Skulltag option: nobotnodes
 	{ "compat_shorttex",				MITYPE_COMPATFLAG, COMPATF_SHORTTEX, 0 },
diff --git a/src/info.cpp b/src/info.cpp
index 69476d29..4d322534 100644
--- a/src/info.cpp
+++ b/src/info.cpp
@@ -55,6 +55,8 @@ extern void LoadActors ();
 extern void InitBotStuff();
 extern void ClearStrifeTypes();
 
+FRandom FState::pr_statetics;
+
 //==========================================================================
 //
 //
diff --git a/src/info.h b/src/info.h
index c2962512..87e62381 100644
--- a/src/info.h
+++ b/src/info.h
@@ -45,6 +45,7 @@
 #include "doomdef.h"
 
 #include "m_fixed.h"
+#include "m_random.h"
 
 struct Baggage;
 class FScanner;
@@ -61,18 +62,19 @@ enum
 
 struct FState
 {
+	FState		*NextState;
+	actionf_p	ActionFunc;
 	WORD		sprite;
 	SWORD		Tics;
-	int			Misc1;			// Was changed to SBYTE, reverted to long for MBF compat
-	int			Misc2;			// Was changed to BYTE, reverted to long for MBF compat
+	WORD		TicRange;
 	BYTE		Frame;
 	BYTE		DefineFlags;	// Unused byte so let's use it during state creation.
+	int			Misc1;			// Was changed to SBYTE, reverted to long for MBF compat
+	int			Misc2;			// Was changed to BYTE, reverted to long for MBF compat
 	short		Light;
 	BYTE		Fullbright:1;	// State is fullbright
 	BYTE		SameFrame:1;	// Ignore Frame (except when spawning actor)
 	BYTE		Fast:1;
-	FState		*NextState;
-	actionf_p	ActionFunc;
 	int			ParameterIndex;
 
 	inline int GetFrame() const
@@ -89,7 +91,11 @@ struct FState
 	}
 	inline int GetTics() const
 	{
-		return Tics;
+		if (TicRange == 0)
+		{
+			return Tics;
+		}
+		return Tics + pr_statetics.GenRand32() % (TicRange + 1);
 	}
 	inline int GetMisc1() const
 	{
@@ -134,6 +140,7 @@ struct FState
 	}
 	static const PClass *StaticFindStateOwner (const FState *state);
 	static const PClass *StaticFindStateOwner (const FState *state, const FActorInfo *info);
+	static FRandom pr_statetics;
 };
 
 struct FStateLabels;
diff --git a/src/r_defs.h b/src/r_defs.h
index a7f7a116..8ad15e76 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -903,11 +903,11 @@ struct side_t
 
 	void SetTextureXScale(int which, fixed_t scale)
 	{
-		textures[which].xscale = scale <= 0? FRACUNIT : scale;
+		textures[which].xscale = scale == 0 ? FRACUNIT : scale;
 	}
 	void SetTextureXScale(fixed_t scale)
 	{
-		textures[top].xscale = textures[mid].xscale = textures[bottom].xscale = scale <= 0? FRACUNIT : scale;
+		textures[top].xscale = textures[mid].xscale = textures[bottom].xscale = scale == 0 ? FRACUNIT : scale;
 	}
 	fixed_t GetTextureXScale(int which) const
 	{
@@ -921,11 +921,11 @@ struct side_t
 
 	void SetTextureYScale(int which, fixed_t scale)
 	{
-		textures[which].yscale = scale <= 0? FRACUNIT : scale;
+		textures[which].yscale = scale == 0 ? FRACUNIT : scale;
 	}
 	void SetTextureYScale(fixed_t scale)
 	{
-		textures[top].yscale = textures[mid].yscale = textures[bottom].yscale = scale <= 0? FRACUNIT : scale;
+		textures[top].yscale = textures[mid].yscale = textures[bottom].yscale = scale == 0 ? FRACUNIT : scale;
 	}
 	fixed_t GetTextureYScale(int which) const
 	{
diff --git a/src/r_segs.cpp b/src/r_segs.cpp
index a40a2ce3..bfeab506 100644
--- a/src/r_segs.cpp
+++ b/src/r_segs.cpp
@@ -2769,6 +2769,7 @@ int WallMost (short *mostbuf, const secplane_t &plane)
 static void PrepWallRoundFix(fixed_t *lwall, fixed_t walxrepeat)
 {
 	// fix for rounding errors
+	walxrepeat = abs(walxrepeat);
 	fixed_t fix = (MirrorFlags & RF_XFLIP) ? walxrepeat-1 : 0;
 	int x;
 
@@ -2803,7 +2804,7 @@ static void PrepWallRoundFix(fixed_t *lwall, fixed_t walxrepeat)
 void PrepWall (fixed_t *swall, fixed_t *lwall, fixed_t walxrepeat)
 { // swall = scale, lwall = texturecolumn
 	double top, bot, i;
-	double xrepeat = walxrepeat;
+	double xrepeat = fabs((double)walxrepeat);
 
 	i = WallSX1 - centerx;
 	top = WallUoverZorg + WallUoverZstep * i;
@@ -2812,7 +2813,14 @@ void PrepWall (fixed_t *swall, fixed_t *lwall, fixed_t walxrepeat)
 	for (int x = WallSX1; x < WallSX2; x++)
 	{
 		double frac = top / bot;
-		lwall[x] = xs_RoundToInt(frac * xrepeat);
+		if (walxrepeat < 0)
+		{
+			lwall[x] = xs_RoundToInt(xrepeat - frac * xrepeat);
+		}
+		else
+		{
+			lwall[x] = xs_RoundToInt(frac * xrepeat);
+		}
 		swall[x] = xs_RoundToInt(frac * WallDepthScale + WallDepthOrg);
 		top += WallUoverZstep;
 		bot += WallInvZstep;
@@ -2823,7 +2831,7 @@ void PrepWall (fixed_t *swall, fixed_t *lwall, fixed_t walxrepeat)
 void PrepLWall (fixed_t *lwall, fixed_t walxrepeat)
 { // lwall = texturecolumn
 	double top, bot, i;
-	double xrepeat = walxrepeat;
+	double xrepeat = fabs((double)walxrepeat);
 	double topstep;
 
 	i = WallSX1 - centerx;
@@ -2835,7 +2843,14 @@ void PrepLWall (fixed_t *lwall, fixed_t walxrepeat)
 
 	for (int x = WallSX1; x < WallSX2; x++)
 	{
-		lwall[x] = xs_RoundToInt(top / bot);
+		if (walxrepeat < 0)
+		{
+			lwall[x] = xs_RoundToInt(xrepeat - top / bot);
+		}
+		else
+		{
+			lwall[x] = xs_RoundToInt(top / bot);
+		}
 		top += topstep;
 		bot += WallInvZstep;
 	}
diff --git a/src/svnrevision.h b/src/svnrevision.h
index 3112d44b..a279ba9d 100644
--- a/src/svnrevision.h
+++ b/src/svnrevision.h
@@ -3,5 +3,5 @@
 // This file was automatically generated by the
 // updaterevision tool. Do not edit by hand.
 
-#define ZD_SVN_REVISION_STRING "3845"
-#define ZD_SVN_REVISION_NUMBER 3845
+#define ZD_SVN_REVISION_STRING "3851"
+#define ZD_SVN_REVISION_NUMBER 3851
diff --git a/src/thingdef/olddecorations.cpp b/src/thingdef/olddecorations.cpp
index 421ff1e8..d4db28e9 100644
--- a/src/thingdef/olddecorations.cpp
+++ b/src/thingdef/olddecorations.cpp
@@ -199,6 +199,7 @@ void ParseOldDecoration(FScanner &sc, EDefinitionType def)
 	if (info->NumOwnedStates == 1)
 	{
 		info->OwnedStates->Tics = -1;
+		info->OwnedStates->TicRange = 0;
 		info->OwnedStates->Misc1 = 0;
 	}
 	else
@@ -226,6 +227,7 @@ void ParseOldDecoration(FScanner &sc, EDefinitionType def)
 			else
 			{
 				info->OwnedStates[i].Tics = -1;
+				info->OwnedStates[i].TicRange = 0;
 				info->OwnedStates[i].Misc1 = 0;
 			}
 
@@ -273,6 +275,7 @@ void ParseOldDecoration(FScanner &sc, EDefinitionType def)
 			else
 			{
 				info->OwnedStates[i].Tics = -1;
+				info->OwnedStates[i].TicRange = 0;
 				info->OwnedStates[i].Misc1 = 0;
 			}
 
@@ -307,12 +310,14 @@ void ParseOldDecoration(FScanner &sc, EDefinitionType def)
 			}
 			info->OwnedStates[i].NextState = &info->OwnedStates[info->NumOwnedStates-1];
 			info->OwnedStates[i].Tics = 5;
+			info->OwnedStates[i].TicRange = 0;
 			info->OwnedStates[i].Misc1 = 0;
 			info->OwnedStates[i].SetAction(FindGlobalActionFunction("A_FreezeDeath"));
 
 			i = info->NumOwnedStates - 1;
 			info->OwnedStates[i].NextState = &info->OwnedStates[i];
 			info->OwnedStates[i].Tics = 1;
+			info->OwnedStates[i].TicRange = 0;
 			info->OwnedStates[i].Misc1 = 0;
 			info->OwnedStates[i].SetAction(FindGlobalActionFunction("A_FreezeDeathChunks"));
 			bag.statedef.SetStateLabel("Ice", &info->OwnedStates[extra.IceDeathStart]);
@@ -671,6 +676,7 @@ static void ParseSpriteFrames (FActorInfo *info, TArray<FState> &states, FScanne
 		}
 
 		state.Tics = rate;
+		state.TicRange = 0;
 
 		while (*token)
 		{
diff --git a/src/thingdef/thingdef_states.cpp b/src/thingdef/thingdef_states.cpp
index 31d49db5..5c2d8160 100644
--- a/src/thingdef/thingdef_states.cpp
+++ b/src/thingdef/thingdef_states.cpp
@@ -56,6 +56,7 @@
 #include "colormatcher.h"
 #include "thingdef_exp.h"
 #include "version.h"
+#include "templates.h"
 
 //==========================================================================
 //***
@@ -237,8 +238,30 @@ do_stop:
 			sc.MustGetString();
 			statestring = sc.String;
 
-			sc.MustGetNumber();
-			state.Tics = clamp<int>(sc.Number, -1, 32767);
+			if (sc.CheckString("RANDOM"))
+			{
+				int min, max;
+
+				sc.MustGetStringName("(");
+				sc.MustGetNumber();
+				min = clamp<int>(sc.Number, -1, SHRT_MAX);
+				sc.MustGetStringName(",");
+				sc.MustGetNumber();
+				max = clamp<int>(sc.Number, -1, SHRT_MAX);
+				sc.MustGetStringName(")");
+				if (min > max)
+				{
+					swapvalues(min, max);
+				}
+				state.Tics = min;
+				state.TicRange = max - min;
+			}
+			else
+			{
+				sc.MustGetNumber();
+				state.Tics = clamp<int>(sc.Number, -1, SHRT_MAX);
+				state.TicRange = 0;
+			}
 
 			while (sc.GetString() && !sc.Crossed)
 			{
diff --git a/wadsrc/static/menudef.txt b/wadsrc/static/menudef.txt
index 1b843246..38ac1bd7 100644
--- a/wadsrc/static/menudef.txt
+++ b/wadsrc/static/menudef.txt
@@ -651,7 +651,7 @@ OptionMenu "VideoOptions"
 	Submenu "Scoreboard Options", 		"ScoreboardOptions"
 	StaticText " "
 	Slider "Screen size",				"screenblocks", 3.0, 12.0, 1.0, 0
-	Slider "Brightness",				"Gamma", 1.0, 3.0, 0.1
+	Slider "Brightness",				"Gamma", 0.75, 3.0, 0.05, 2
 	Option "Vertical Sync",				"vid_vsync", "OnOff"
 	Option "Column render mode",		"r_columnmethod", "ColumnMethods"
 
diff --git a/wadsrc/static/menudef.z b/wadsrc/static/menudef.z
index e495e5da..93d88b5f 100644
--- a/wadsrc/static/menudef.z
+++ b/wadsrc/static/menudef.z
@@ -214,7 +214,7 @@ OptionMenu "VideoOptions"
 	StaticText " "
 	Slider "Screen size",				"screenblocks", 3.0, 12.0, 1.0, 0
 
-	Slider "Gamma correction",			"Gamma", 						1.0, 3.0, 0.1
+	Slider "Gamma correction",			"Gamma",						0.75, 3.0, 0.05, 2
 	Slider "Brightness",				"vid_brightness",				-0.8,0.8, 0.05
 	Slider "Contrast",					"vid_contrast",	   				0.1, 3.0, 0.1