diff --git a/CMakeLists.txt b/CMakeLists.txt
index b70221859..96e32a06d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.0)
 # DO NOT CHANGE THIS SRB2 STRING! Some variable names depend on this string.
 # Version change is fine.
 project(SRB2
-	VERSION 2.1.24
+	VERSION 2.1.25
 	LANGUAGES C)
 
 if(${PROJECT_SOURCE_DIR} MATCHES ${PROJECT_BINARY_DIR})
diff --git a/appveyor.yml b/appveyor.yml
index b37bd1a65..d58976fd5 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 2.1.24.{branch}-{build}
+version: 2.1.25.{branch}-{build}
 os: MinGW
 
 environment:
diff --git a/src/config.h.in b/src/config.h.in
index 1e6a7f514..63d24a3be 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -35,7 +35,7 @@
 #define ASSET_HASH_PLAYER_DTA "cfca0f1c73023cbbd8f844f45480f799"
 #define ASSET_HASH_RINGS_DTA  "85901ad4bf94637e5753d2ac2c03ea26"
 #ifdef USE_PATCH_DTA
-#define ASSET_HASH_PATCH_DTA  "b04fd9624bfd94dc96dcf4f400f7deb4"
+#define ASSET_HASH_PATCH_DTA  "636BD1C9269629AEAC2C3C184754D471"
 #endif
 
 #endif
diff --git a/src/d_clisrv.c b/src/d_clisrv.c
index 274fe398a..28d327ece 100644
--- a/src/d_clisrv.c
+++ b/src/d_clisrv.c
@@ -44,6 +44,7 @@
 #include "lzf.h"
 #include "lua_script.h"
 #include "lua_hook.h"
+#include "md5.h"
 
 #ifdef CLIENT_LOADINGSCREEN
 // cl loading screen
@@ -116,6 +117,9 @@ static UINT8 resynch_local_inprogress = false; // WE are desynched and getting p
 static UINT8 player_joining = false;
 UINT8 hu_resynching = 0;
 
+UINT8 adminpassmd5[16];
+boolean adminpasswordset = false;
+
 // Client specific
 static ticcmd_t localcmds;
 static ticcmd_t localcmds2;
@@ -3760,6 +3764,7 @@ static void HandlePacketFromPlayer(SINT8 node)
 	XBOXSTATIC INT32 netconsole;
 	XBOXSTATIC tic_t realend, realstart;
 	XBOXSTATIC UINT8 *pak, *txtpak, numtxtpak;
+	XBOXSTATIC UINT8 finalmd5[16];/* Well, it's the cool thing to do? */
 FILESTAMP
 
 	txtpak = NULL;
@@ -3958,6 +3963,32 @@ FILESTAMP
 				textcmd[0] += (UINT8)netbuffer->u.textcmd[0];
 			}
 			break;
+		case PT_LOGIN:
+			if (client)
+				break;
+
+#ifndef NOMD5
+			if (doomcom->datalength < 16)/* ignore partial sends */
+				break;
+
+			if (!adminpasswordset)
+			{
+				CONS_Printf(M_GetText("Password from %s failed (no password set).\n"), player_names[netconsole]);
+				break;
+			}
+
+			// Do the final pass to compare with the sent md5
+			D_MD5PasswordPass(adminpassmd5, 16, va("PNUM%02d", netconsole), &finalmd5);
+
+			if (!memcmp(netbuffer->u.md5sum, finalmd5, 16))
+			{
+				CONS_Printf(M_GetText("%s passed authentication.\n"), player_names[netconsole]);
+				COM_BufInsertText(va("promote %d\n", netconsole)); // do this immediately
+			}
+			else
+				CONS_Printf(M_GetText("Password from %s failed.\n"), player_names[netconsole]);
+#endif
+			break;
 		case PT_NODETIMEOUT:
 		case PT_CLIENTQUIT:
 			if (client)
@@ -4841,3 +4872,29 @@ tic_t GetLag(INT32 node)
 {
 	return gametic - nettics[node];
 }
+
+void D_MD5PasswordPass(const UINT8 *buffer, size_t len, const char *salt, void *dest)
+{
+#ifdef NOMD5
+	(void)buffer;
+	(void)len;
+	(void)salt;
+	memset(dest, 0, 16);
+#else
+	XBOXSTATIC char tmpbuf[256];
+	const size_t sl = strlen(salt);
+
+	if (len > 256-sl)
+		len = 256-sl;
+
+	memcpy(tmpbuf, buffer, len);
+	memmove(&tmpbuf[len], salt, sl);
+	//strcpy(&tmpbuf[len], salt);
+	len += strlen(salt);
+	if (len < 256)
+		memset(&tmpbuf[len],0,256-len);
+
+	// Yes, we intentionally md5 the ENTIRE buffer regardless of size...
+	md5_buffer(tmpbuf, 256, dest);
+#endif
+}
diff --git a/src/d_clisrv.h b/src/d_clisrv.h
index 8443b3fc0..c005f3f9a 100644
--- a/src/d_clisrv.h
+++ b/src/d_clisrv.h
@@ -70,6 +70,9 @@ typedef enum
 	PT_NODETIMEOUT,   // Packet sent to self if the connection times out.
 	PT_RESYNCHING,    // Packet sent to resync players.
 	                  // Blocks game advance until synched.
+
+	PT_LOGIN,         // Login attempt from the client.
+
 #ifdef NEWPING
 	PT_PING,          // Packet sent to tell clients the other client's latency to server.
 #endif
@@ -398,6 +401,7 @@ typedef struct
 		UINT8 textcmd[MAXTEXTCMD+1];        //       66049 bytes (wut??? 64k??? More like 257 bytes...)
 		filetx_pak filetxpak;               //         139 bytes
 		clientconfig_pak clientcfg;         //         136 bytes
+		UINT8 md5sum[16];
 		serverinfo_pak serverinfo;          //        1024 bytes
 		serverrefuse_pak serverrefuse;      //       65025 bytes (somehow I feel like those values are garbage...)
 		askinfo_pak askinfo;                //          61 bytes
@@ -526,5 +530,10 @@ void D_ResetTiccmds(void);
 tic_t GetLag(INT32 node);
 UINT8 GetFreeXCmdSize(void);
 
+void D_MD5PasswordPass(const UINT8 *buffer, size_t len, const char *salt, void *dest);
+
 extern UINT8 hu_resynching;
+
+extern UINT8 adminpassmd5[16];
+extern boolean adminpasswordset;
 #endif
diff --git a/src/d_netcmd.c b/src/d_netcmd.c
index 998eef05d..cc9127af0 100644
--- a/src/d_netcmd.c
+++ b/src/d_netcmd.c
@@ -34,18 +34,19 @@
 #include "p_spec.h"
 #include "m_cheat.h"
 #include "d_clisrv.h"
+#include "d_net.h"
 #include "v_video.h"
 #include "d_main.h"
 #include "m_random.h"
 #include "f_finale.h"
 #include "filesrch.h"
 #include "mserv.h"
-#include "md5.h"
 #include "z_zone.h"
 #include "lua_script.h"
 #include "lua_hook.h"
 #include "m_cond.h"
 #include "m_anigif.h"
+#include "md5.h"
 
 #ifdef NETGAME_DEVMODE
 #define CV_RESTRICT CV_NETVAR
@@ -143,7 +144,6 @@ static void Command_Clearscores_f(void);
 // Remote Administration
 static void Command_Changepassword_f(void);
 static void Command_Login_f(void);
-static void Got_Login(UINT8 **cp, INT32 playernum);
 static void Got_Verification(UINT8 **cp, INT32 playernum);
 static void Got_Removal(UINT8 **cp, INT32 playernum);
 static void Command_Verify_f(void);
@@ -437,7 +437,6 @@ void D_RegisterServerCommands(void)
 
 	// Remote Administration
 	COM_AddCommand("password", Command_Changepassword_f);
-	RegisterNetXCmd(XD_LOGIN, Got_Login);
 	COM_AddCommand("login", Command_Login_f); // useful in dedicated to kick off remote admin
 	COM_AddCommand("promote", Command_Verify_f);
 	RegisterNetXCmd(XD_VERIFIED, Got_Verification);
@@ -2652,35 +2651,7 @@ static void Got_Teamchange(UINT8 **cp, INT32 playernum)
 // Attempts to make password system a little sane without
 // rewriting the entire goddamn XD_file system
 //
-#include "md5.h"
-static void D_MD5PasswordPass(const UINT8 *buffer, size_t len, const char *salt, void *dest)
-{
-#ifdef NOMD5
-	(void)buffer;
-	(void)len;
-	(void)salt;
-	memset(dest, 0, 16);
-#else
-	XBOXSTATIC char tmpbuf[256];
-	const size_t sl = strlen(salt);
-
-	if (len > 256-sl)
-		len = 256-sl;
-	memcpy(tmpbuf, buffer, len);
-	memmove(&tmpbuf[len], salt, sl);
-	//strcpy(&tmpbuf[len], salt);
-	len += strlen(salt);
-	if (len < 256)
-		memset(&tmpbuf[len],0,256-len);
-
-	// Yes, we intentionally md5 the ENTIRE buffer regardless of size...
-	md5_buffer(tmpbuf, 256, dest);
-#endif
-}
-
 #define BASESALT "basepasswordstorage"
-static UINT8 adminpassmd5[16];
-static boolean adminpasswordset = false;
 
 void D_SetPassword(const char *pw)
 {
@@ -2718,7 +2689,6 @@ static void Command_Login_f(void)
 	// If we have no MD5 support then completely disable XD_LOGIN responses for security.
 	CONS_Alert(CONS_NOTICE, "Remote administration commands are not supported in this build.\n");
 #else
-	XBOXSTATIC UINT8 finalmd5[16];
 	const char *pw;
 
 	if (!netgame)
@@ -2738,47 +2708,15 @@ static void Command_Login_f(void)
 	pw = COM_Argv(1);
 
 	// Do the base pass to get what the server has (or should?)
-	D_MD5PasswordPass((const UINT8 *)pw, strlen(pw), BASESALT, &finalmd5);
+	D_MD5PasswordPass((const UINT8 *)pw, strlen(pw), BASESALT, &netbuffer->u.md5sum);
 
 	// Do the final pass to get the comparison the server will come up with
-	D_MD5PasswordPass(finalmd5, 16, va("PNUM%02d", consoleplayer), &finalmd5);
+	D_MD5PasswordPass(netbuffer->u.md5sum, 16, va("PNUM%02d", consoleplayer), &netbuffer->u.md5sum);
 
 	CONS_Printf(M_GetText("Sending login... (Notice only given if password is correct.)\n"));
 
-	SendNetXCmd(XD_LOGIN, finalmd5, 16);
-#endif
-}
-
-static void Got_Login(UINT8 **cp, INT32 playernum)
-{
-#ifdef NOMD5
-	// If we have no MD5 support then completely disable XD_LOGIN responses for security.
-	(void)cp;
-	(void)playernum;
-#else
-	UINT8 sentmd5[16], finalmd5[16];
-
-	READMEM(*cp, sentmd5, 16);
-
-	if (client)
-		return;
-
-	if (!adminpasswordset)
-	{
-		CONS_Printf(M_GetText("Password from %s failed (no password set).\n"), player_names[playernum]);
-		return;
-	}
-
-	// Do the final pass to compare with the sent md5
-	D_MD5PasswordPass(adminpassmd5, 16, va("PNUM%02d", playernum), &finalmd5);
-
-	if (!memcmp(sentmd5, finalmd5, 16))
-	{
-		CONS_Printf(M_GetText("%s passed authentication.\n"), player_names[playernum]);
-		COM_BufInsertText(va("promote %d\n", playernum)); // do this immediately
-	}
-	else
-		CONS_Printf(M_GetText("Password from %s failed.\n"), player_names[playernum]);
+	netbuffer->packettype = PT_LOGIN;
+	HSendPacket(servernode, true, 0, 16);
 #endif
 }
 
@@ -4000,7 +3938,7 @@ static void Command_ExitLevel_f(void)
 		CONS_Printf(M_GetText("This only works in a netgame.\n"));
 	else if (!(server || (IsPlayerAdmin(consoleplayer))))
 		CONS_Printf(M_GetText("Only the server or a remote admin can use this.\n"));
-	else if (gamestate != GS_LEVEL || demoplayback)
+	else if (( gamestate != GS_LEVEL && gamestate != GS_CREDITS ) || demoplayback)
 		CONS_Printf(M_GetText("You must be in a level to use this.\n"));
 	else
 		SendNetXCmd(XD_EXITLEVEL, NULL, 0);
diff --git a/src/d_netcmd.h b/src/d_netcmd.h
index b82065c82..244693356 100644
--- a/src/d_netcmd.h
+++ b/src/d_netcmd.h
@@ -125,8 +125,8 @@ typedef enum
 	XD_ADDPLAYER,   // 10
 	XD_TEAMCHANGE,  // 11
 	XD_CLEARSCORES, // 12
-	XD_LOGIN,       // 13
-	XD_VERIFIED,    // 14
+	// UNUSED          13 (Because I don't want to change these comments)
+	XD_VERIFIED = 14,//14
 	XD_RANDOMSEED,  // 15
 	XD_RUNSOC,      // 16
 	XD_REQADDFILE,  // 17
diff --git a/src/doomdef.h b/src/doomdef.h
index 6b6afbf1b..1c034f5f7 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -150,9 +150,9 @@ extern FILE *logstream;
 // we use comprevision and compbranch instead.
 #else
 #define VERSION    201 // Game version
-#define SUBVERSION 24  // more precise version number
-#define VERSIONSTRING "v2.1.24"
-#define VERSIONSTRINGW L"v2.1.24"
+#define SUBVERSION 25  // more precise version number
+#define VERSIONSTRING "v2.1.25"
+#define VERSIONSTRINGW L"v2.1.25"
 // Hey! If you change this, add 1 to the MODVERSION below!
 // Otherwise we can't force updates!
 #endif
@@ -217,7 +217,7 @@ extern FILE *logstream;
 // it's only for detection of the version the player is using so the MS can alert them of an update.
 // Only set it higher, not lower, obviously.
 // Note that we use this to help keep internal testing in check; this is why v2.1.0 is not version "1".
-#define MODVERSION 29
+#define MODVERSION 30
 
 // To version config.cfg, MAJOREXECVERSION is set equal to MODVERSION automatically.
 // Increment MINOREXECVERSION whenever a config change is needed that does not correspond
diff --git a/src/doomstat.h b/src/doomstat.h
index 8050a1beb..7f8b5fd6e 100644
--- a/src/doomstat.h
+++ b/src/doomstat.h
@@ -131,6 +131,7 @@ extern UINT8 skincolor_redteam, skincolor_blueteam, skincolor_redring, skincolor
 
 extern tic_t countdowntimer;
 extern boolean countdowntimeup;
+extern boolean exitfadestarted;
 
 typedef struct
 {
diff --git a/src/g_game.c b/src/g_game.c
index f9477f91e..c61056f35 100644
--- a/src/g_game.c
+++ b/src/g_game.c
@@ -15,6 +15,7 @@
 #include "console.h"
 #include "d_main.h"
 #include "d_player.h"
+#include "d_clisrv.h"
 #include "f_finale.h"
 #include "p_setup.h"
 #include "p_saveg.h"
@@ -130,6 +131,7 @@ UINT8 skincolor_bluering = SKINCOLOR_STEELBLUE;
 
 tic_t countdowntimer = 0;
 boolean countdowntimeup = false;
+boolean exitfadestarted = false;
 
 cutscene_t *cutscenes[128];
 
@@ -1874,7 +1876,9 @@ boolean G_Responder(event_t *ev)
 
 		if (F_CreditResponder(ev))
 		{
-			F_StartGameEvaluation();
+			// Skip credits for everyone
+			if (!netgame || server || IsPlayerAdmin(consoleplayer))
+				SendNetXCmd(XD_EXITLEVEL, NULL, 0);
 			return true;
 		}
 	}
@@ -2696,6 +2700,10 @@ void G_ExitLevel(void)
 		// Remove CEcho text on round end.
 		HU_ClearCEcho();
 	}
+	else if (gamestate == GS_CREDITS)
+	{
+		F_StartGameEvaluation();
+	}
 }
 
 // See also the enum GameType in doomstat.h
@@ -3694,7 +3702,7 @@ void G_InitNew(UINT8 pultmode, const char *mapname, boolean resetplayer, boolean
 	{
 		// Clear a bunch of variables
 		tokenlist = token = sstimer = redscore = bluescore = lastmap = 0;
-		countdown = countdown2 = 0;
+		countdown = countdown2 = exitfadestarted = 0;
 
 		for (i = 0; i < MAXPLAYERS; i++)
 		{
diff --git a/src/p_map.c b/src/p_map.c
index 95ad02588..3ce82b4da 100644
--- a/src/p_map.c
+++ b/src/p_map.c
@@ -3345,6 +3345,7 @@ static boolean PIT_ChangeSector(mobj_t *thing, boolean realcrush)
 boolean P_CheckSector(sector_t *sector, boolean crunch)
 {
 	msecnode_t *n;
+	size_t i;
 
 	nofit = false;
 	crushchange = crunch;
@@ -3359,9 +3360,57 @@ boolean P_CheckSector(sector_t *sector, boolean crunch)
 
 
 	// First, let's see if anything will keep it from crushing.
+
+	// Sal: This stupid function chain is required to fix polyobjects not being able to crush.
+	// Monster Iestyn: don't use P_CheckSector actually just look for objects in the blockmap instead
+	validcount++;
+
+	for (i = 0; i < sector->linecount; i++)
+	{
+		if (sector->lines[i]->polyobj)
+		{
+			polyobj_t *po = sector->lines[i]->polyobj;
+			if (po->validcount == validcount)
+				continue; // skip if already checked
+			if (!(po->flags & POF_SOLID))
+				continue;
+			if (po->lines[0]->backsector == sector) // Make sure you're currently checking the control sector
+			{
+				INT32 x, y;
+				po->validcount = validcount;
+
+				for (y = po->blockbox[BOXBOTTOM]; y <= po->blockbox[BOXTOP]; ++y)
+				{
+					for (x = po->blockbox[BOXLEFT]; x <= po->blockbox[BOXRIGHT]; ++x)
+					{
+						mobj_t *mo;
+
+						if (x < 0 || y < 0 || x >= bmapwidth || y >= bmapheight)
+							continue;
+
+						mo = blocklinks[y * bmapwidth + x];
+
+						for (; mo; mo = mo->bnext)
+						{
+							// Monster Iestyn: do we need to check if a mobj has already been checked? ...probably not I suspect
+
+							if (!P_MobjInsidePolyobj(po, mo))
+								continue;
+
+							if (!PIT_ChangeSector(mo, false))
+							{
+								nofit = true;
+								return nofit;
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
 	if (sector->numattached)
 	{
-		size_t i;
 		sector_t *sec;
 		for (i = 0; i < sector->numattached; i++)
 		{
@@ -3421,9 +3470,53 @@ boolean P_CheckSector(sector_t *sector, boolean crunch)
 	} while (n); // repeat from scratch until all things left are marked valid
 
 	// Nothing blocked us, so lets crush for real!
+
+	// Sal: This stupid function chain is required to fix polyobjects not being able to crush.
+	// Monster Iestyn: don't use P_CheckSector actually just look for objects in the blockmap instead
+	validcount++;
+
+	for (i = 0; i < sector->linecount; i++)
+	{
+		if (sector->lines[i]->polyobj)
+		{
+			polyobj_t *po = sector->lines[i]->polyobj;
+			if (po->validcount == validcount)
+				continue; // skip if already checked
+			if (!(po->flags & POF_SOLID))
+				continue;
+			if (po->lines[0]->backsector == sector) // Make sure you're currently checking the control sector
+			{
+				INT32 x, y;
+				po->validcount = validcount;
+
+				for (y = po->blockbox[BOXBOTTOM]; y <= po->blockbox[BOXTOP]; ++y)
+				{
+					for (x = po->blockbox[BOXLEFT]; x <= po->blockbox[BOXRIGHT]; ++x)
+					{
+						mobj_t *mo;
+
+						if (x < 0 || y < 0 || x >= bmapwidth || y >= bmapheight)
+							continue;
+
+						mo = blocklinks[y * bmapwidth + x];
+
+						for (; mo; mo = mo->bnext)
+						{
+							// Monster Iestyn: do we need to check if a mobj has already been checked? ...probably not I suspect
+
+							if (!P_MobjInsidePolyobj(po, mo))
+								continue;
+
+							PIT_ChangeSector(mo, true);
+							return nofit;
+						}
+					}
+				}
+			}
+		}
+	}
 	if (sector->numattached)
 	{
-		size_t i;
 		sector_t *sec;
 		for (i = 0; i < sector->numattached; i++)
 		{
diff --git a/src/p_maputl.c b/src/p_maputl.c
index 1be57399c..5368c137e 100644
--- a/src/p_maputl.c
+++ b/src/p_maputl.c
@@ -418,10 +418,6 @@ void P_CameraLineOpening(line_t *linedef)
 		if (front->ffloors || back->ffloors)
 		{
 			ffloor_t *rover;
-			fixed_t highestceiling = highceiling;
-			fixed_t lowestceiling = opentop;
-			fixed_t highestfloor = openbottom;
-			fixed_t lowestfloor = lowfloor;
 			fixed_t delta1, delta2;
 
 			// Check for frontsector's fake floors
@@ -437,15 +433,15 @@ void P_CameraLineOpening(line_t *linedef)
 
 					delta1 = abs(mapcampointer->z - (bottomheight + ((topheight - bottomheight)/2)));
 					delta2 = abs(thingtop - (bottomheight + ((topheight - bottomheight)/2)));
-					if (bottomheight < lowestceiling && delta1 >= delta2)
-						lowestceiling = bottomheight;
-					else if (bottomheight < highestceiling && delta1 >= delta2)
-						highestceiling = bottomheight;
+					if (bottomheight < opentop && delta1 >= delta2)
+						opentop = bottomheight;
+					else if (bottomheight < highceiling && delta1 >= delta2)
+						highceiling = bottomheight;
 
-					if (topheight > highestfloor && delta1 < delta2)
-						highestfloor = topheight;
-					else if (topheight > lowestfloor && delta1 < delta2)
-						lowestfloor = topheight;
+					if (topheight > openbottom && delta1 < delta2)
+						openbottom = topheight;
+					else if (topheight > lowfloor && delta1 < delta2)
+						lowfloor = topheight;
 				}
 
 			// Check for backsectors fake floors
@@ -461,28 +457,16 @@ void P_CameraLineOpening(line_t *linedef)
 
 					delta1 = abs(mapcampointer->z - (bottomheight + ((topheight - bottomheight)/2)));
 					delta2 = abs(thingtop - (bottomheight + ((topheight - bottomheight)/2)));
-					if (bottomheight < lowestceiling && delta1 >= delta2)
-						lowestceiling = bottomheight;
-					else if (bottomheight < highestceiling && delta1 >= delta2)
-						highestceiling = bottomheight;
+					if (bottomheight < opentop && delta1 >= delta2)
+						opentop = bottomheight;
+					else if (bottomheight < highceiling && delta1 >= delta2)
+						highceiling = bottomheight;
 
-					if (topheight > highestfloor && delta1 < delta2)
-						highestfloor = topheight;
-					else if (topheight > lowestfloor && delta1 < delta2)
-						lowestfloor = topheight;
+					if (topheight > openbottom && delta1 < delta2)
+						openbottom = topheight;
+					else if (topheight > lowfloor && delta1 < delta2)
+						lowfloor = topheight;
 				}
-
-			if (highestceiling < highceiling)
-				highceiling = highestceiling;
-
-			if (highestfloor > openbottom)
-				openbottom = highestfloor;
-
-			if (lowestceiling < opentop)
-				opentop = lowestceiling;
-
-			if (lowestfloor > lowfloor)
-				lowfloor = lowestfloor;
 		}
 		openrange = opentop - openbottom;
 		return;
@@ -500,23 +484,26 @@ void P_LineOpening(line_t *linedef, mobj_t *mobj)
 		return;
 	}
 
-	// Treat polyobjects kind of like 3D Floors
-#ifdef POLYOBJECTS
-	if (linedef->polyobj && (linedef->polyobj->flags & POF_TESTHEIGHT))
-	{
-		front = linedef->frontsector;
-		back = linedef->frontsector;
-	}
-	else
-#endif
-	{
-		front = linedef->frontsector;
-		back = linedef->backsector;
-	}
+	front = linedef->frontsector;
+	back = linedef->backsector;
 
 	I_Assert(front != NULL);
 	I_Assert(back != NULL);
 
+#ifdef POLYOBJECTS
+	if (linedef->polyobj)
+	{
+		// set these defaults so that polyobjects don't interfere with collision above or below them
+		opentop = INT32_MAX;
+		openbottom = INT32_MIN;
+		highceiling = INT32_MIN;
+		lowfloor = INT32_MAX;
+#ifdef ESLOPE
+		opentopslope = openbottomslope = NULL;
+#endif
+	}
+	else
+#endif
 	{ // Set open and high/low values here
 		fixed_t frontheight, backheight;
 
@@ -622,25 +609,49 @@ void P_LineOpening(line_t *linedef, mobj_t *mobj)
 				}
 			}
 		}
-
-		// Check for fake floors in the sector.
-		if (front->ffloors || back->ffloors
 #ifdef POLYOBJECTS
-		    || linedef->polyobj
+		if (linedef->polyobj)
+		{
+			// Treat polyobj's backsector like a 3D Floor
+			if (linedef->polyobj->flags & POF_TESTHEIGHT)
+			{
+				const sector_t *polysec = linedef->backsector;
+				fixed_t polytop, polybottom;
+				fixed_t delta1, delta2;
+
+				if (linedef->polyobj->flags & POF_CLIPPLANES)
+				{
+					polytop = polysec->ceilingheight;
+					polybottom = polysec->floorheight;
+				}
+				else
+				{
+					polytop = INT32_MAX;
+					polybottom = INT32_MIN;
+				}
+
+				delta1 = abs(mobj->z - (polybottom + ((polytop - polybottom)/2)));
+				delta2 = abs(thingtop - (polybottom + ((polytop - polybottom)/2)));
+
+				if (polybottom < opentop && delta1 >= delta2)
+					opentop = polybottom;
+				else if (polybottom < highceiling && delta1 >= delta2)
+					highceiling = polybottom;
+
+				if (polytop > openbottom && delta1 < delta2)
+					openbottom = polytop;
+				else if (polytop > lowfloor && delta1 < delta2)
+					lowfloor = polytop;
+			}
+			// otherwise don't do anything special, pretend there's nothing else there
+		}
+		else
 #endif
-		   )
+		// Check for fake floors in the sector.
+		if (front->ffloors || back->ffloors)
 		{
 			ffloor_t *rover;
-
-			fixed_t highestceiling = highceiling;
-			fixed_t lowestceiling = opentop;
-			fixed_t highestfloor = openbottom;
-			fixed_t lowestfloor = lowfloor;
 			fixed_t delta1, delta2;
-#ifdef ESLOPE
-			pslope_t *ceilingslope = opentopslope;
-			pslope_t *floorslope = openbottomslope;
-#endif
 
 			// Check for frontsector's fake floors
 			for (rover = front->ffloors; rover; rover = rover->next)
@@ -663,26 +674,26 @@ void P_LineOpening(line_t *linedef, mobj_t *mobj)
 
 				if (delta1 >= delta2 && !(rover->flags & FF_PLATFORM)) // thing is below FOF
 				{
-					if (bottomheight < lowestceiling) {
-						lowestceiling = bottomheight;
+					if (bottomheight < opentop) {
+						opentop = bottomheight;
 #ifdef ESLOPE
-						ceilingslope = *rover->b_slope;
+						opentopslope = *rover->b_slope;
 #endif
 					}
-					else if (bottomheight < highestceiling)
-						highestceiling = bottomheight;
+					else if (bottomheight < highceiling)
+						highceiling = bottomheight;
 				}
 
 				if (delta1 < delta2 && !(rover->flags & FF_REVERSEPLATFORM)) // thing is above FOF
 				{
-					if (topheight > highestfloor) {
-						highestfloor = topheight;
+					if (topheight > openbottom) {
+						openbottom = topheight;
 #ifdef ESLOPE
-						floorslope = *rover->t_slope;
+						openbottomslope = *rover->t_slope;
 #endif
 					}
-					else if (topheight > lowestfloor)
-						lowestfloor = topheight;
+					else if (topheight > lowfloor)
+						lowfloor = topheight;
 				}
 			}
 
@@ -707,75 +718,28 @@ void P_LineOpening(line_t *linedef, mobj_t *mobj)
 
 				if (delta1 >= delta2 && !(rover->flags & FF_PLATFORM)) // thing is below FOF
 				{
-					if (bottomheight < lowestceiling) {
-						lowestceiling = bottomheight;
+					if (bottomheight < opentop) {
+						opentop = bottomheight;
 #ifdef ESLOPE
-						ceilingslope = *rover->b_slope;
+						opentopslope = *rover->b_slope;
 #endif
 					}
-					else if (bottomheight < highestceiling)
-						highestceiling = bottomheight;
+					else if (bottomheight < highceiling)
+						highceiling = bottomheight;
 				}
 
 				if (delta1 < delta2 && !(rover->flags & FF_REVERSEPLATFORM)) // thing is above FOF
 				{
-					if (topheight > highestfloor) {
-						highestfloor = topheight;
+					if (topheight > openbottom) {
+						openbottom = topheight;
 #ifdef ESLOPE
-						floorslope = *rover->t_slope;
+						openbottomslope = *rover->t_slope;
 #endif
 					}
-					else if (topheight > lowestfloor)
-						lowestfloor = topheight;
+					else if (topheight > lowfloor)
+						lowfloor = topheight;
 				}
 			}
-
-#ifdef POLYOBJECTS
-			// Treat polyobj's backsector like a 3D Floor
-			if (linedef->polyobj && (linedef->polyobj->flags & POF_TESTHEIGHT))
-			{
-				const sector_t *polysec = linedef->backsector;
-
-				delta1 = abs(mobj->z - (polysec->floorheight + ((polysec->ceilingheight - polysec->floorheight)/2)));
-				delta2 = abs(thingtop - (polysec->floorheight + ((polysec->ceilingheight - polysec->floorheight)/2)));
-				if (polysec->floorheight < lowestceiling && delta1 >= delta2) {
-					lowestceiling = polysec->floorheight;
-#ifdef ESLOPE
-					ceilingslope = NULL;
-#endif
-				}
-				else if (polysec->floorheight < highestceiling && delta1 >= delta2)
-					highestceiling = polysec->floorheight;
-
-				if (polysec->ceilingheight > highestfloor && delta1 < delta2) {
-					highestfloor = polysec->ceilingheight;
-#ifdef ESLOPE
-					floorslope = NULL;
-#endif
-				}
-				else if (polysec->ceilingheight > lowestfloor && delta1 < delta2)
-					lowestfloor = polysec->ceilingheight;
-			}
-#endif
-			if (highestceiling < highceiling)
-				highceiling = highestceiling;
-
-			if (highestfloor > openbottom) {
-				openbottom = highestfloor;
-#ifdef ESLOPE
-				openbottomslope = floorslope;
-#endif
-			}
-
-			if (lowestceiling < opentop) {
-				opentop = lowestceiling;
-#ifdef ESLOPE
-				opentopslope = ceilingslope;
-#endif
-			}
-
-			if (lowestfloor > lowfloor)
-				lowfloor = lowestfloor;
 		}
 	}
 
diff --git a/src/p_mobj.c b/src/p_mobj.c
index 850ec2987..e2543f553 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -6033,7 +6033,7 @@ void P_RunOverlays(void)
 		{
 			angle_t viewingangle;
 
-			if (players[displayplayer].awayviewtics)
+			if (players[displayplayer].awayviewtics && players[displayplayer].awayviewmobj != NULL && !P_MobjWasRemoved(players[displayplayer].awayviewmobj))
 				viewingangle = R_PointToAngle2(mo->target->x, mo->target->y, players[displayplayer].awayviewmobj->x, players[displayplayer].awayviewmobj->y);
 			else if (!camera.chase && players[displayplayer].mo)
 				viewingangle = R_PointToAngle2(mo->target->x, mo->target->y, players[displayplayer].mo->x, players[displayplayer].mo->y);
diff --git a/src/p_polyobj.c b/src/p_polyobj.c
index 82c57c85b..ba01ee442 100644
--- a/src/p_polyobj.c
+++ b/src/p_polyobj.c
@@ -1860,7 +1860,8 @@ void T_PolyObjWaypoint(polywaypoint_t *th)
 		po->lines[0]->backsector->floorheight = target->z - amtz;
 		po->lines[0]->backsector->ceilingheight = target->z + amtz;
 		// Sal: Remember to check your sectors!
-		P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage));
+		// Monster Iestyn: we only need to bother with the back sector, now that P_CheckSector automatically checks the blockmap
+		//  updating objects in the front one too just added teleporting to ground bugs
 		P_CheckSector(po->lines[0]->backsector, (boolean)(po->damage));
 		// Apply action to mirroring polyobjects as well
 		start = 0;
@@ -1874,7 +1875,8 @@ void T_PolyObjWaypoint(polywaypoint_t *th)
 			po->lines[0]->backsector->floorheight += diffz; // move up/down by same amount as the parent did
 			po->lines[0]->backsector->ceilingheight += diffz;
 			// Sal: Remember to check your sectors!
-			P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage));
+			// Monster Iestyn: we only need to bother with the back sector, now that P_CheckSector automatically checks the blockmap
+			//  updating objects in the front one too just added teleporting to ground bugs
 			P_CheckSector(po->lines[0]->backsector, (boolean)(po->damage));
 		}
 
@@ -2037,8 +2039,9 @@ void T_PolyObjWaypoint(polywaypoint_t *th)
 	po->lines[0]->backsector->floorheight += momz;
 	po->lines[0]->backsector->ceilingheight += momz;
 	// Sal: Remember to check your sectors!
-	P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage)); // frontsector is NEEDED for crushing
-	P_CheckSector(po->lines[0]->backsector, (boolean)(po->damage)); // backsector may not be necessary, but just in case
+	// Monster Iestyn: we only need to bother with the back sector, now that P_CheckSector automatically checks the blockmap
+	//  updating objects in the front one too just added teleporting to ground bugs
+	P_CheckSector(po->lines[0]->backsector, (boolean)(po->damage));
 
 	// Apply action to mirroring polyobjects as well
 	start = 0;
@@ -2052,7 +2055,8 @@ void T_PolyObjWaypoint(polywaypoint_t *th)
 		po->lines[0]->backsector->floorheight += momz;
 		po->lines[0]->backsector->ceilingheight += momz;
 		// Sal: Remember to check your sectors!
-		P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage));
+		// Monster Iestyn: we only need to bother with the back sector, now that P_CheckSector automatically checks the blockmap
+		//  updating objects in the front one too just added teleporting to ground bugs
 		P_CheckSector(po->lines[0]->backsector, (boolean)(po->damage));
 	}
 }
diff --git a/src/p_setup.c b/src/p_setup.c
index 033e99f10..b2636c350 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -2311,7 +2311,7 @@ static void P_LevelInitStuff(void)
 			players[i].lives = cv_startinglives.value;
 		}
 
-		players[i].realtime = countdown = countdown2 = 0;
+		players[i].realtime = countdown = countdown2 = exitfadestarted = 0;
 
 		players[i].gotcontinue = false;
 
diff --git a/src/p_slopes.c b/src/p_slopes.c
index 4e12b104f..19d0bbbb7 100644
--- a/src/p_slopes.c
+++ b/src/p_slopes.c
@@ -584,23 +584,28 @@ static pslope_t *P_NewVertexSlope(INT16 tag1, INT16 tag2, INT16 tag3, UINT8 flag
 //
 void P_CopySectorSlope(line_t *line)
 {
-   sector_t *fsec = line->frontsector;
-   int i, special = line->special;
+	sector_t *fsec = line->frontsector;
+	int i, special = line->special;
 
-   // Check for copy linedefs
-   for(i = -1; (i = P_FindSectorFromLineTag(line, i)) >= 0;)
-   {
-      sector_t *srcsec = sectors + i;
+	// Check for copy linedefs
+	for (i = -1; (i = P_FindSectorFromLineTag(line, i)) >= 0;)
+	{
+		sector_t *srcsec = sectors + i;
 
-      if((special - 719) & 1 && !fsec->f_slope && srcsec->f_slope)
-         fsec->f_slope = srcsec->f_slope; //P_CopySlope(srcsec->f_slope);
-      if((special - 719) & 2 && !fsec->c_slope && srcsec->c_slope)
-         fsec->c_slope = srcsec->c_slope; //P_CopySlope(srcsec->c_slope);
-   }
+		if ((special - 719) & 1 && !fsec->f_slope && srcsec->f_slope)
+			fsec->f_slope = srcsec->f_slope; //P_CopySlope(srcsec->f_slope);
+		if ((special - 719) & 2 && !fsec->c_slope && srcsec->c_slope)
+			fsec->c_slope = srcsec->c_slope; //P_CopySlope(srcsec->c_slope);
+	}
 
-   fsec->hasslope = true;
+	fsec->hasslope = true;
 
-   line->special = 0; // Linedef was use to set slopes, it finished its job, so now make it a normal linedef
+	// if this is an FOF control sector, make sure any target sectors also are marked as having slopes
+	if (fsec->numattached)
+		for (i = 0; i < (int)fsec->numattached; i++)
+			sectors[fsec->attached[i]].hasslope = true;
+
+	line->special = 0; // Linedef was use to set slopes, it finished its job, so now make it a normal linedef
 }
 
 //
diff --git a/src/p_spec.c b/src/p_spec.c
index f3be86ee1..d4ead74fe 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -4973,6 +4973,10 @@ static ffloor_t *P_AddFakeFloor(sector_t *sec, sector_t *sec2, line_t *master, f
 	// Add slopes
 	ffloor->t_slope = &sec2->c_slope;
 	ffloor->b_slope = &sec2->f_slope;
+	// mark the target sector as having slopes, if the FOF has any of its own
+	// (this fixes FOF slopes glitching initially at level load in software mode)
+	if (sec2->hasslope)
+		sec->hasslope = true;
 #endif
 
 	if ((flags & FF_SOLID) && (master->flags & ML_EFFECT1)) // Block player only
diff --git a/src/p_user.c b/src/p_user.c
index f04386fec..3710e87f1 100644
--- a/src/p_user.c
+++ b/src/p_user.c
@@ -8741,14 +8741,8 @@ void P_PlayerThink(player_t *player)
 	if (player->flashcount)
 		player->flashcount--;
 
-	// Re-fixed by Jimita (11-12-2018)
-	if (player->awayviewtics)
-	{
+	if (player->awayviewtics && player->awayviewtics != -1)
 		player->awayviewtics--;
-		if (!player->awayviewtics)
-			player->awayviewtics = -1;
-		// The timer might've reached zero, but we'll run the remote view camera anyway by setting it to -1.
-	}
 
 	/// \note do this in the cheat code
 	if (player->pflags & PF_NOCLIP)
@@ -8824,6 +8818,48 @@ void P_PlayerThink(player_t *player)
 	if (player->exiting && countdown2)
 		player->exiting = 5;
 
+	// The following code is disabled for now as this causes the game to freeze sometimes
+	// Monster Iestyn -- 16/08/19
+#if 0
+	// Same check as below, just at 1 second before
+	// so we can fade music
+	if (!exitfadestarted &&
+		player->exiting > 0 && player->exiting <= 1*TICRATE &&
+		(!multiplayer || gametype == GT_COOP ? !mapheaderinfo[gamemap-1]->musinterfadeout : true) &&
+			// don't fade if we're fading during intermission. follows Y_StartIntermission intertype = int_coop
+		(gametype == GT_RACE || gametype == GT_COMPETITION ? countdown2 == 0 : true) && // don't fade on timeout
+		player->lives > 0 && // don't fade on game over (competition)
+		P_IsLocalPlayer(player))
+	{
+		if (cv_playersforexit.value)
+		{
+			INT32 i;
+
+			for (i = 0; i < MAXPLAYERS; i++)
+			{
+				if (!playeringame[i] || players[i].spectator || players[i].bot)
+					continue;
+				if (players[i].lives <= 0)
+					continue;
+
+				if (!players[i].exiting || players[i].exiting > 1*TICRATE)
+					break;
+			}
+
+			if (i == MAXPLAYERS)
+			{
+				exitfadestarted = true;
+				S_FadeOutStopMusic(1*MUSICRATE);
+			}
+		}
+		else
+		{
+			exitfadestarted = true;
+			S_FadeOutStopMusic(1*MUSICRATE);
+		}
+	}
+#endif
+
 	if (player->exiting == 2 || countdown2 == 2)
 	{
 		if (cv_playersforexit.value) // Count to be sure everyone's exited
@@ -9526,9 +9562,6 @@ void P_PlayerAfterThink(player_t *player)
 		}
 	}
 
-	if (player->awayviewtics < 0)
-		player->awayviewtics = 0;
-
 	// spectator invisibility and nogravity.
 	if ((netgame || multiplayer) && player->spectator)
 	{
diff --git a/src/r_data.c b/src/r_data.c
index 29a9c52bb..bd12eb248 100644
--- a/src/r_data.c
+++ b/src/r_data.c
@@ -404,16 +404,7 @@ void R_LoadTextures(void)
 	// but the alternative is to spend a ton of time checking and re-checking all previous entries just to skip any potentially patched textures.
 	for (w = 0, numtextures = 0; w < numwadfiles; w++)
 	{
-		if (wadfiles[w]->type == RET_PK3)
-		{
-			texstart = W_CheckNumForFolderStartPK3("textures/", (UINT16)w, 0);
-			texend = W_CheckNumForFolderEndPK3("textures/", (UINT16)w, texstart);
-		}
-		else
-		{
-			texstart = W_CheckNumForNamePwad(TX_START, (UINT16)w, 0) + 1;
-			texend = W_CheckNumForNamePwad(TX_END, (UINT16)w, 0);
-		}
+		// Count the textures from TEXTURES lumps
 
 		texturesLumpPos = W_CheckNumForNamePwad("TEXTURES", (UINT16)w, 0);
 		while (texturesLumpPos != INT16_MAX)
@@ -422,19 +413,43 @@ void R_LoadTextures(void)
 			texturesLumpPos = W_CheckNumForNamePwad("TEXTURES", (UINT16)w, texturesLumpPos + 1);
 		}
 
-		// Add all the textures between TX_START and TX_END
-		if (texstart != INT16_MAX && texend != INT16_MAX)
+		// Count single-patch textures
+
+		if (wadfiles[w]->type == RET_PK3)
+		{
+			texstart = W_CheckNumForFolderStartPK3("textures/", (UINT16)w, 0);
+			texend = W_CheckNumForFolderEndPK3("textures/", (UINT16)w, texstart);
+		}
+		else
+		{
+			texstart = W_CheckNumForNamePwad(TX_START, (UINT16)w, 0);
+			texend = W_CheckNumForNamePwad(TX_END, (UINT16)w, 0);
+		}
+
+		if (texstart == INT16_MAX || texend == INT16_MAX)
+			continue;
+
+		texstart++; // Do not count the first marker
+
+		// PK3s have subfolders, so we can't just make a simple sum
+		if (wadfiles[w]->type == RET_PK3)
+		{
+			for (j = texstart; j < texend; j++)
+			{
+				if (!W_IsLumpFolder((UINT16)w, j)) // Check if lump is a folder; if not, then count it
+					numtextures++;
+			}
+		}
+		else // Add all the textures between TX_START and TX_END
 		{
 			numtextures += (UINT32)(texend - texstart);
 		}
-
-		// If no textures found by this point, bomb out
-		if (!numtextures && w == (numwadfiles - 1))
-		{
-			I_Error("No textures detected in any WADs!\n");
-		}
 	}
 
+	// If no textures found by this point, bomb out
+	if (!numtextures)
+		I_Error("No textures detected in any WADs!\n");
+
 	// Allocate memory and initialize to 0 for all the textures we are initialising.
 	// There are actually 5 buffers allocated in one for convenience.
 	textures = Z_Calloc((numtextures * sizeof(void *)) * 5, PU_STATIC, NULL);
@@ -469,7 +484,7 @@ void R_LoadTextures(void)
 		}
 		else
 		{
-			texstart = W_CheckNumForNamePwad(TX_START, (UINT16)w, 0) + 1;
+			texstart = W_CheckNumForNamePwad(TX_START, (UINT16)w, 0);
 			texend = W_CheckNumForNamePwad(TX_END, (UINT16)w, 0);
 			texturesLumpPos = W_CheckNumForNamePwad("TEXTURES", (UINT16)w, 0);
 			if (texturesLumpPos != INT16_MAX)
@@ -479,9 +494,16 @@ void R_LoadTextures(void)
 		if (texstart == INT16_MAX || texend == INT16_MAX)
 			continue;
 
+		texstart++; // Do not count the first marker
+
 		// Work through each lump between the markers in the WAD.
-		for (j = 0; j < (texend - texstart); i++, j++)
+		for (j = 0; j < (texend - texstart); j++)
 		{
+			if (wadfiles[w]->type == RET_PK3)
+			{
+				if (W_IsLumpFolder((UINT16)w, texstart + j)) // Check if lump is a folder
+					continue; // If it is then SKIP IT
+			}
 			patchlump = W_CacheLumpNumPwad((UINT16)w, texstart + j, PU_CACHE);
 
 			//CONS_Printf("\n\"%s\" is a single patch, dimensions %d x %d",W_CheckNameForNumPwad((UINT16)w,texstart+j),patchlump->width, patchlump->height);
@@ -506,9 +528,9 @@ void R_LoadTextures(void)
 			k = 1;
 			while (k << 1 <= texture->width)
 				k <<= 1;
-
 			texturewidthmask[i] = k - 1;
 			textureheight[i] = texture->height << FRACBITS;
+			i++;
 		}
 	}
 }
diff --git a/src/sdl/macosx/Srb2mac.xcodeproj/project.pbxproj b/src/sdl/macosx/Srb2mac.xcodeproj/project.pbxproj
index 878db3d8d..9297833e2 100644
--- a/src/sdl/macosx/Srb2mac.xcodeproj/project.pbxproj
+++ b/src/sdl/macosx/Srb2mac.xcodeproj/project.pbxproj
@@ -1219,7 +1219,7 @@
 		C01FCF4B08A954540054247B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				CURRENT_PROJECT_VERSION = 2.1.24;
+				CURRENT_PROJECT_VERSION = 2.1.25;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"$(inherited)",
 					NORMALSRB2,
@@ -1231,7 +1231,7 @@
 		C01FCF4C08A954540054247B /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				CURRENT_PROJECT_VERSION = 2.1.24;
+				CURRENT_PROJECT_VERSION = 2.1.25;
 				GCC_ENABLE_FIX_AND_CONTINUE = NO;
 				GCC_GENERATE_DEBUGGING_SYMBOLS = NO;
 				GCC_PREPROCESSOR_DEFINITIONS = (
diff --git a/src/sdl12/macosx/Srb2mac.xcodeproj/project.pbxproj b/src/sdl12/macosx/Srb2mac.xcodeproj/project.pbxproj
index 6b3997b1f..d67903819 100644
--- a/src/sdl12/macosx/Srb2mac.xcodeproj/project.pbxproj
+++ b/src/sdl12/macosx/Srb2mac.xcodeproj/project.pbxproj
@@ -1219,7 +1219,7 @@
 		C01FCF4B08A954540054247B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				CURRENT_PROJECT_VERSION = 2.1.24;
+				CURRENT_PROJECT_VERSION = 2.1.25;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"$(inherited)",
 					NORMALSRB2,
@@ -1231,7 +1231,7 @@
 		C01FCF4C08A954540054247B /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				CURRENT_PROJECT_VERSION = 2.1.24;
+				CURRENT_PROJECT_VERSION = 2.1.25;
 				GCC_ENABLE_FIX_AND_CONTINUE = NO;
 				GCC_GENERATE_DEBUGGING_SYMBOLS = NO;
 				GCC_PREPROCESSOR_DEFINITIONS = (
diff --git a/src/w_wad.c b/src/w_wad.c
index e18c5a084..7de64f9ad 100644
--- a/src/w_wad.c
+++ b/src/w_wad.c
@@ -1159,6 +1159,22 @@ boolean W_IsLumpWad(lumpnum_t lumpnum)
 	return false; // WADs should never be inside non-PK3s as far as SRB2 is concerned
 }
 
+//
+// W_IsLumpFolder
+// Is the lump a folder? (in a PK3 obviously)
+//
+boolean W_IsLumpFolder(UINT16 wad, UINT16 lump)
+{
+	if (wadfiles[wad]->type == RET_PK3)
+	{
+		const char *name = wadfiles[wad]->lumpinfo[lump].name2;
+
+		return (name[strlen(name)-1] == '/'); // folders end in '/'
+	}
+
+	return false; // non-PK3s don't have folders
+}
+
 #ifdef HAVE_ZLIB
 /* report a zlib or i/o error */
 void zerr(int ret)
diff --git a/src/w_wad.h b/src/w_wad.h
index e2e17740f..87566c3ee 100644
--- a/src/w_wad.h
+++ b/src/w_wad.h
@@ -154,6 +154,7 @@ size_t W_LumpLengthPwad(UINT16 wad, UINT16 lump);
 size_t W_LumpLength(lumpnum_t lumpnum);
 
 boolean W_IsLumpWad(lumpnum_t lumpnum); // for loading maps from WADs in PK3s
+boolean W_IsLumpFolder(UINT16 wad, UINT16 lump); // for detecting folder "lumps"
 
 #ifdef HAVE_ZLIB
 void zerr(int ret); // zlib error checking