diff --git a/docs/rh-log.txt b/docs/rh-log.txt
index e8325e4a35..bd48ce1ce2 100644
--- a/docs/rh-log.txt
+++ b/docs/rh-log.txt
@@ -1,4 +1,10 @@
 September 16, 2009  (Changes by Graf Zahl)
+- Fixed: The deprecated flag handler for the old bounce flags needs to clear
+  BOUNCE_MBF and BOUNCE_UseSeeSound, too, when clearing one of these flags.
+- Fixed: When adding the AVOIDMELEE code the code was accidentally changed so that
+  friendly monsters could no longer acquire targets by themselves.
+- Renamed WIF_BOT_MELEE to WIF_MELEEWEAPON because it's no longer a bot only flag.
+- Added MBF's monster_backing feature as an actor flag: AVOIDMELEE.
 - Gez's misc. bugs patch:
 * Moves the dog sound out of the Doom-specific sounds in SNDINFO to address this,
 * Renames the dog actor to MBFHelperDog to prevent name conflicts,
diff --git a/src/actor.h b/src/actor.h
index d2ecf4ef93..b490aeade3 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -399,7 +399,7 @@ enum EBounceFlags
 	// for them that are not present in ZDoom, so it is necessary to identify it properly.
 	BOUNCE_MBF = 1<<12,			// This in itself is not a valid mode, but replaces MBF's MF_BOUNCE flag.
 
-	BOUNCE_TypeMask = BOUNCE_Walls | BOUNCE_Floors | BOUNCE_Ceilings | BOUNCE_Actors | BOUNCE_AutoOff | BOUNCE_HereticType,
+	BOUNCE_TypeMask = BOUNCE_Walls | BOUNCE_Floors | BOUNCE_Ceilings | BOUNCE_Actors | BOUNCE_AutoOff | BOUNCE_HereticType | BOUNCE_MBF,
 
 	// The three "standard" types of bounciness are:
 	// HERETIC - Missile will only bounce off the floor once and then enter
@@ -760,6 +760,7 @@ public:
 	BYTE			movedir;		// 0-7
 	SBYTE			visdir;
 	SWORD			movecount;		// when 0, select a new dir
+	SWORD			strafecount;	// for MF3_AVOIDMELEE
 	TObjPtr<AActor> target;			// thing being chased/attacked (or NULL)
 									// also the originator for missiles
 	TObjPtr<AActor>	lastenemy;		// Last known enemy -- killough 2/15/98
diff --git a/src/b_bot.cpp b/src/b_bot.cpp
index b03c067f77..3911264cd6 100644
--- a/src/b_bot.cpp
+++ b/src/b_bot.cpp
@@ -136,7 +136,6 @@ void InitBotStuff()
 		{ "SkullRod", 27000000, 0, "HornRodFX1" },
 		{ "SkullRodPowered", 27000000, 0, "HornRodFX2" },
 		{ "PhoenixRod", 18350080, WIF_BOT_REACTION_SKILL_THING|WIF_BOT_EXPLOSIVE, "PhoenixFX1" },
-		{ "PhoenixRodPowered", 0, WIF_BOT_MELEE, "PhoenixFX2" },
 		{ "Mace", 27000000, WIF_BOT_REACTION_SKILL_THING, "MaceFX2" },
 		{ "MacePowered", 27000000, WIF_BOT_REACTION_SKILL_THING|WIF_BOT_EXPLOSIVE, "MaceFX4" },
 		{ "FWeapHammer", 22000000, 0, "HammerMissile" },
diff --git a/src/b_func.cpp b/src/b_func.cpp
index 5da2e8e2cc..adaa755c2c 100644
--- a/src/b_func.cpp
+++ b/src/b_func.cpp
@@ -175,7 +175,7 @@ void FCajunMaster::Dofire (AActor *actor, ticcmd_t *cmd)
 		(actor->y + actor->vely) - (enemy->y + enemy->vely));
 
 	//FIRE EACH TYPE OF WEAPON DIFFERENT: Here should all the different weapons go.
-	if (actor->player->ReadyWeapon->WeaponFlags & WIF_BOT_MELEE)
+	if (actor->player->ReadyWeapon->WeaponFlags & WIF_MELEEWEAPON)
 	{
 		if ((actor->player->ReadyWeapon->ProjectileType != NULL))
 		{
diff --git a/src/b_move.cpp b/src/b_move.cpp
index 896ce93429..332160f1ab 100644
--- a/src/b_move.cpp
+++ b/src/b_move.cpp
@@ -342,7 +342,7 @@ void FCajunMaster::TurnToAng (AActor *actor)
 
 		if(actor->player->enemy)
 			if(!actor->player->dest) //happens when running after item in combat situations, or normal, prevents weak turns
-				if(actor->player->ReadyWeapon->ProjectileType == NULL && !(actor->player->ReadyWeapon->WeaponFlags & WIF_BOT_MELEE))
+				if(actor->player->ReadyWeapon->ProjectileType == NULL && !(actor->player->ReadyWeapon->WeaponFlags & WIF_MELEEWEAPON))
 					if(Check_LOS(actor, actor->player->enemy, SHOOTFOV+5*ANGLE_1))
 						maxturn = 3;
 	}
diff --git a/src/g_shared/a_pickups.h b/src/g_shared/a_pickups.h
index 8832161d14..b402fcf591 100644
--- a/src/g_shared/a_pickups.h
+++ b/src/g_shared/a_pickups.h
@@ -322,6 +322,7 @@ enum
 	WIF_NO_AUTO_SWITCH =	0x00001000,	// never switch to this weapon when it's picked up
 	WIF_STAFF2_KICKBACK =	0x00002000, // the powered-up Heretic staff has special kickback
 	WIF_NOAUTOAIM =			0x00004000, // this weapon never uses autoaim (useful for ballistic projectiles)
+	WIF_MELEEWEAPON =		0x00008000,	// melee weapon. Used by bots and monster AI.
 
 	WIF_CHEATNOTWEAPON	=	0x08000000,	// Give cheat considers this not a weapon (used by Sigil)
 
@@ -329,7 +330,6 @@ enum
 
 	WIF_BOT_REACTION_SKILL_THING = 1<<31, // I don't understand this
 	WIF_BOT_EXPLOSIVE =		1<<30,		// weapon fires an explosive
-	WIF_BOT_MELEE =			1<<29,		// melee weapon
 	WIF_BOT_BFG =			1<<28,		// this is a BFG
 };
 
diff --git a/src/p_enemy.cpp b/src/p_enemy.cpp
index 9937eefa54..d2a1e1c601 100644
--- a/src/p_enemy.cpp
+++ b/src/p_enemy.cpp
@@ -65,6 +65,7 @@ static FRandom pr_dropoff ("Dropoff");
 static FRandom pr_defect ("Defect");
 
 static FRandom pr_skiptarget("SkipTarget");
+static FRandom pr_enemystrafe("EnemyStrafe");
 
 // movement interpolation is fine for objects that are moved by their own
 // velocity. But for monsters it is problematic.
@@ -772,9 +773,7 @@ void P_NewChaseDir(AActor * actor)
 	fixed_t deltax;
 	fixed_t deltay;
 
-#ifdef MBF_STUFF
 	actor->strafecount = 0;
-#endif
 
 	if ((actor->flags5&MF5_CHASEGOAL || actor->goal == actor->target) && actor->goal!=NULL)
 	{
@@ -882,15 +881,16 @@ void P_NewChaseDir(AActor * actor)
 	else
 #endif
 
-#ifdef MBF_STUFF
 	// MBF's monster_backing option. Made an actor flag instead. Also cleaned the code up to make it readable.
 	// Todo: implement the movement logic
+	AActor *target = actor->target;
 	if (target->health > 0 && !actor->IsFriend(target))
     {   // Live enemy target
 
 		if (actor->flags3 & MF3_AVOIDMELEE)
 		{
 			bool ismeleeattacker = false;
+			fixed_t dist = P_AproxDistance(actor->x-target->x, actor->y-target->y);
 			if (target->player == NULL)
 			{
 				ismeleeattacker = (target->MissileState == NULL && dist < (target->meleerange + target->radius)*2);
@@ -899,7 +899,7 @@ void P_NewChaseDir(AActor * actor)
 			{
 				// melee range of player weapon is a parameter of the action function and cannot be checked here.
 				// Add a new weapon property?
-				ismeleeattacker = (target->player->ReadyWeapon->WeaponFlags & WIF_BOT_MELEE && dist < MELEERANGE*3);
+				ismeleeattacker = (target->player->ReadyWeapon->WeaponFlags & WIF_MELEEWEAPON && dist < MELEERANGE*3);
 			}
 			if (ismeleeattacker)
 			{
@@ -908,18 +908,14 @@ void P_NewChaseDir(AActor * actor)
 			}
 	    }
 	}
-#endif
-
 
 	P_DoNewChaseDir(actor, deltax, deltay);
 
-#ifdef MBF_STUFF
 	// If strafing, set movecount to strafecount so that old Doom
 	// logic still works the same, except in the strafing part
 
 	if (actor->strafecount)
 		actor->movecount = actor->strafecount;
-#endif
 
 }
 
@@ -1566,7 +1562,7 @@ bool P_LookForPlayers (AActor *actor, INTBOOL allaround, FLookExParams *params)
 		}
 #endif
 		// [SP] If you don't see any enemies in deathmatch, look for players (but only when friend to a specific player.)
-		if (actor->FriendPlayer == 0) return false;
+		if (actor->FriendPlayer == 0) return result;
 		if (result || !deathmatch) return true;
 
 
@@ -2156,7 +2152,11 @@ void A_DoChase (AActor *actor, bool fastchase, FState *meleestate, FState *missi
 	}
 
 	// turn towards movement direction if not there yet
-	if (actor->movedir < 8)
+	if (actor->strafecount)
+	{
+		A_FaceTarget(actor);
+	}
+	else if (actor->movedir < 8)
 	{
 		actor->angle &= (angle_t)(7<<29);
 		delta = actor->angle - (actor->movedir << 29);
@@ -2404,6 +2404,9 @@ void A_DoChase (AActor *actor, bool fastchase, FState *meleestate, FState *missi
 	// chase towards player
 	//
 
+	if (actor->strafecount)
+		actor->strafecount--;
+
 	// class bosses don't do this when strafing
 	if ((!fastchase || !actor->FastChaseStrafeCount) && !dontmove)
 	{
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index f3313e7786..326b5c9621 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -240,6 +240,7 @@ void AActor::Serialize (FArchive &arc)
 		<< movedir
 		<< visdir
 		<< movecount
+		<< strafecount
 		<< target
 		<< lastenemy
 		<< LastHeard
diff --git a/src/textures/tgatexture.cpp b/src/textures/tgatexture.cpp
index 595cef5222..41bbb11b8c 100644
--- a/src/textures/tgatexture.cpp
+++ b/src/textures/tgatexture.cpp
@@ -354,12 +354,14 @@ void FTGATexture::MakeTexture ()
 	int step_x = (hdr.bpp>>3);
 	int Pitch = Width * step_x;
 
+	/*
 	if (hdr.img_desc&32)
 	{
 		ptr += (Width-1) * step_x;
 		step_x =- step_x;
 	}
-	if (!(hdr.img_desc&64))
+	*/
+	if (!(hdr.img_desc&32))
 	{
 		ptr += (Height-1) * Pitch;
 		Pitch = -Pitch;
@@ -557,12 +559,14 @@ int FTGATexture::CopyTrueColorPixels(FBitmap *bmp, int x, int y, int w, int h, i
 	int step_x = (hdr.bpp>>3);
 	int Pitch = Width * step_x;
 
+	/*
 	if (hdr.img_desc&32)
 	{
 		ptr += (Width-1) * step_x;
 		step_x =- step_x;
 	}
-	if (!(hdr.img_desc&64))
+	*/
+	if (!(hdr.img_desc&32))
 	{
 		ptr += (Height-1) * Pitch;
 		Pitch = -Pitch;
diff --git a/src/thingdef/thingdef_data.cpp b/src/thingdef/thingdef_data.cpp
index c65cb5d21d..5b207c854a 100644
--- a/src/thingdef/thingdef_data.cpp
+++ b/src/thingdef/thingdef_data.cpp
@@ -141,6 +141,7 @@ static FFlagDef ActorFlags[]=
 	DEFINE_FLAG(MF3, NOTARGET, AActor, flags3),
 	DEFINE_FLAG(MF3, DONTGIB, AActor, flags3),
 	DEFINE_FLAG(MF3, NOBLOCKMONST, AActor, flags3),
+	DEFINE_FLAG(MF3, AVOIDMELEE, AActor, flags3),
 	DEFINE_FLAG(MF3, FULLVOLDEATH, AActor, flags3),
 	DEFINE_FLAG(MF3, FOILINVUL, AActor, flags3),
 	DEFINE_FLAG(MF3, NOTELEOTHER, AActor, flags3),
@@ -295,7 +296,7 @@ static FFlagDef WeaponFlags[] =
 	DEFINE_FLAG(WIF, POWERED_UP, AWeapon, WeaponFlags),
 	DEFINE_FLAG(WIF, STAFF2_KICKBACK, AWeapon, WeaponFlags),
 	DEFINE_FLAG(WIF_BOT, EXPLOSIVE, AWeapon, WeaponFlags),
-	DEFINE_FLAG2(WIF_BOT_MELEE, MELEEWEAPON, AWeapon, WeaponFlags),
+	DEFINE_FLAG(WIF, MELEEWEAPON, AWeapon, WeaponFlags),
 	DEFINE_FLAG(WIF_BOT, BFG, AWeapon, WeaponFlags),
 	DEFINE_FLAG(WIF, CHEATNOTWEAPON, AWeapon, WeaponFlags),
 	DEFINE_FLAG(WIF, NO_AUTO_SWITCH, AWeapon, WeaponFlags),
diff --git a/src/thingdef/thingdef_properties.cpp b/src/thingdef/thingdef_properties.cpp
index f04c6ba8c6..4f29d272c8 100644
--- a/src/thingdef/thingdef_properties.cpp
+++ b/src/thingdef/thingdef_properties.cpp
@@ -130,15 +130,15 @@ void HandleDeprecatedFlags(AActor *defaults, FActorInfo *info, bool set, int ind
 		break;
 	// the bounce flags will set the compatibility bounce modes to remain compatible
 	case DEPF_HERETICBOUNCE:
-		defaults->BounceFlags &= ~BOUNCE_TypeMask;
+		defaults->BounceFlags &= ~(BOUNCE_TypeMask|BOUNCE_UseSeeSound);
 		if (set) defaults->BounceFlags |= BOUNCE_HereticCompat;
 		break;
 	case DEPF_HEXENBOUNCE:
-		defaults->BounceFlags &= ~BOUNCE_TypeMask;
+		defaults->BounceFlags &= ~(BOUNCE_TypeMask|BOUNCE_UseSeeSound);
 		if (set) defaults->BounceFlags |= BOUNCE_HexenCompat;
 		break;
 	case DEPF_DOOMBOUNCE:
-		defaults->BounceFlags &= ~BOUNCE_TypeMask;
+		defaults->BounceFlags &= ~(BOUNCE_TypeMask|BOUNCE_UseSeeSound);
 		if (set) defaults->BounceFlags |= BOUNCE_DoomCompat;
 		break;
 	case DEPF_PICKUPFLASH:
diff --git a/src/version.h b/src/version.h
index 283bfd413f..8896eb713d 100644
--- a/src/version.h
+++ b/src/version.h
@@ -75,7 +75,7 @@
 // SAVESIG should match SAVEVER.
 
 // MINSAVEVER is the minimum level snapshot version that can be loaded.
-#define MINSAVEVER 1823
+#define MINSAVEVER 1848
 
 #if SVN_REVISION_NUMBER < MINSAVEVER
 // Never write a savegame with a version lower than what we need
diff --git a/wadsrc/static/actors/heretic/hereticweaps.txt b/wadsrc/static/actors/heretic/hereticweaps.txt
index 93f1f56fb9..993da14859 100644
--- a/wadsrc/static/actors/heretic/hereticweaps.txt
+++ b/wadsrc/static/actors/heretic/hereticweaps.txt
@@ -1034,6 +1034,7 @@ ACTOR PhoenixRodPowered : PhoenixRod native
 {
 	Game Heretic
 	+WEAPON.POWERED_UP
+	+WEAPON.MELEEWEAPON
 	Weapon.SisterWeapon "PhoenixRod"
 	Weapon.AmmoGive 0