diff --git a/src/command.c b/src/command.c
index 3eebe32d..6d9c86d3 100644
--- a/src/command.c
+++ b/src/command.c
@@ -902,7 +902,10 @@ static void COM_Add_f(void)
 		return;
 	}
 
-	CV_AddValue(cvar, atoi(COM_Argv(2)));
+	if (( cvar->flags & CV_FLOAT ))
+		CV_Set(cvar, va("%f", FIXED_TO_FLOAT (cvar->value) + atof(COM_Argv(2))));
+	else
+		CV_AddValue(cvar, atoi(COM_Argv(2)));
 }
 
 // =========================================================================
diff --git a/src/d_clisrv.c b/src/d_clisrv.c
index 1dc2c142..213f5dde 100644
--- a/src/d_clisrv.c
+++ b/src/d_clisrv.c
@@ -1428,8 +1428,14 @@ static void SV_SendPlayerInfo(INT32 node)
 	UINT8 i;
 	netbuffer->packettype = PT_PLAYERINFO;
 
-	for (i = 0; i < MAXPLAYERS; i++)
+	for (i = 0; i < MSCOMPAT_MAXPLAYERS; i++)
 	{
+		if (i >= MAXPLAYERS)
+		{
+			netbuffer->u.playerinfo[i].node = 255;
+			continue;
+		}
+
 		if (!playeringame[i])
 		{
 			netbuffer->u.playerinfo[i].node = 255; // This slot is empty.
@@ -1477,7 +1483,7 @@ static void SV_SendPlayerInfo(INT32 node)
 			netbuffer->u.playerinfo[i].data |= 0x80;
 	}
 
-	HSendPacket(node, false, 0, sizeof(plrinfo) * MAXPLAYERS);
+	HSendPacket(node, false, 0, sizeof(plrinfo) * MSCOMPAT_MAXPLAYERS);
 }
 
 /** Sends a PT_SERVERCFG packet
diff --git a/src/d_clisrv.h b/src/d_clisrv.h
index d7f033b6..e961c38f 100644
--- a/src/d_clisrv.h
+++ b/src/d_clisrv.h
@@ -470,7 +470,7 @@ typedef struct
 		serverrefuse_pak serverrefuse;      //       65025 bytes (somehow I feel like those values are garbage...)
 		askinfo_pak askinfo;                //          61 bytes
 		msaskinfo_pak msaskinfo;            //          22 bytes
-		plrinfo playerinfo[MAXPLAYERS];     //         576 bytes(?)
+		plrinfo playerinfo[MSCOMPAT_MAXPLAYERS];//         576 bytes(?)
 		plrconfig playerconfig[MAXPLAYERS]; // (up to) 528 bytes(?)
 		INT32 filesneedednum;               //           4 bytes
 		filesneededconfig_pak filesneededcfg; //       ??? bytes
diff --git a/src/d_netcmd.c b/src/d_netcmd.c
index 0bb87556..7dff1231 100644
--- a/src/d_netcmd.c
+++ b/src/d_netcmd.c
@@ -2040,7 +2040,7 @@ static void Command_View_f(void)
 		return;
 	}
 
-	displayplayerp = &displayplayers[viewnum];
+	displayplayerp = &displayplayers[viewnum-1];
 
 	if (COM_Argc() > 1)/* switch to player */
 	{
diff --git a/src/d_netfil.c b/src/d_netfil.c
index 4dcd3da4..76b66836 100644
--- a/src/d_netfil.c
+++ b/src/d_netfil.c
@@ -130,7 +130,8 @@ UINT8 *PutFileNeeded(UINT16 firstfile)
 
 		nameonly(strcpy(wadfilename, wadfiles[i]->filename));
 
-		if (p + 1 + 4 + strlen(wadfilename) + 16 > p_start + MAXFILENEEDED)
+		// Look below at the WRITE macros to understand what these numbers mean.
+		if (p + 1 + 4 + min(strlen(wadfilename) + 1, MAX_WADPATH) + 16 > p_start + MAXFILENEEDED)
 		{
 			// Too many files to send all at once
 			if (netbuffer->packettype == PT_MOREFILESNEEDED)
diff --git a/src/doomdef.h b/src/doomdef.h
index 4ab40853..24b52e8d 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -252,6 +252,9 @@ extern FILE *logstream;
 #define PLAYERSMASK (MAXPLAYERS-1)
 #define MAXPLAYERNAME 21
 
+// Master Server compatibility ONLY
+#define MSCOMPAT_MAXPLAYERS (32)
+
 typedef enum
 {
 	SKINCOLOR_NONE = 0,
diff --git a/src/g_game.c b/src/g_game.c
index 10bd76ac..b8a1a3bf 100644
--- a/src/g_game.c
+++ b/src/g_game.c
@@ -6477,10 +6477,10 @@ void G_WriteStanding(UINT8 ranking, char *name, INT32 skinnum, UINT8 color, UINT
 {
 	char temp[16];
 
-	if (demoinfo_p && (UINT32)(*demoinfo_p) == 0)
+	if (demoinfo_p && *(UINT32 *)demoinfo_p == 0)
 	{
 		WRITEUINT8(demo_p, DEMOMARKER); // add the demo end marker
-		WRITEUINT32(demoinfo_p, demo_p - demobuffer);
+		*(UINT32 *)demoinfo_p = demo_p - demobuffer;
 	}
 
 	WRITEUINT8(demo_p, DW_STANDING);
@@ -8172,16 +8172,17 @@ boolean G_CheckDemoStatus(void)
 
 void G_SaveDemo(void)
 {
-	UINT8 *p = demobuffer+16; // checksum position
+	UINT8 *p = demobuffer+16; // after version
+	UINT32 length;
 #ifdef NOMD5
 	UINT8 i;
 #endif
 
 	// Ensure extrainfo pointer is always available, even if no info is present.
-	if (demoinfo_p && (UINT32)(*demoinfo_p) == 0)
+	if (demoinfo_p && *(UINT32 *)demoinfo_p == 0)
 	{
 		WRITEUINT8(demo_p, DEMOMARKER); // add the demo end marker
-		WRITEUINT32(demoinfo_p, (UINT32)(demo_p - demobuffer));
+		*(UINT32 *)demoinfo_p = demo_p - demobuffer;
 	}
 	WRITEUINT8(demo_p, DW_END); // Mark end of demo extra data.
 
@@ -8227,12 +8228,14 @@ void G_SaveDemo(void)
 		sprintf(writepoint, "%s.lmp", demo_slug);
 	}
 
+	length = *(UINT32 *)demoinfo_p;
+	WRITEUINT32(demoinfo_p, length);
 #ifdef NOMD5
 	for (i = 0; i < 16; i++, p++)
 		*p = M_RandomByte(); // This MD5 was chosen by fair dice roll and most likely < 50% correct.
 #else
 	// Make a checksum of everything after the checksum in the file up to the end of the standard data. Extrainfo is freely modifiable.
-	md5_buffer((char *)p+16, (demobuffer + (UINT32)*demoinfo_p) - (p+16), p);
+	md5_buffer((char *)p+16, (demobuffer + length) - (p+16), p);
 #endif
 
 
diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index 63cde0ca..6a08b1c7 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -1319,7 +1319,7 @@ static void HWR_SplitWall(sector_t *sector, wallVert3D *wallVerts, INT32 texnum,
 
 // HWR_DrawSkyWalls
 // Draw walls into the depth buffer so that anything behind is culled properly
-static void HWR_DrawSkyWall(wallVert3D *wallVerts, FSurfaceInfo *Surf, fixed_t bottom, fixed_t top)
+static void HWR_DrawSkyWall(wallVert3D *wallVerts, FSurfaceInfo *Surf)
 {
 	HWD.pfnSetTexture(NULL);
 	// no texture
@@ -1327,9 +1327,6 @@ static void HWR_DrawSkyWall(wallVert3D *wallVerts, FSurfaceInfo *Surf, fixed_t b
 	wallVerts[0].t = wallVerts[1].t = 0;
 	wallVerts[0].s = wallVerts[3].s = 0;
 	wallVerts[2].s = wallVerts[1].s = 0;
-	// set top/bottom coords
-	wallVerts[2].y = wallVerts[3].y = FIXED_TO_FLOAT(top); // No real way to find the correct height of this
-	wallVerts[0].y = wallVerts[1].y = FIXED_TO_FLOAT(bottom); // worldlow/bottom because it needs to cover up the lower thok barrier wall
 	HWR_ProjectWall(wallVerts, Surf, PF_Invisible|PF_Clip|PF_NoTexture, 255, NULL);
 	// PF_Invisible so it's not drawn into the colour buffer
 	// PF_NoTexture for no texture
@@ -1462,6 +1459,111 @@ static void HWR_StoreWallRange(double startfrac, double endfrac)
 		worldlow  = gr_backsector->floorheight;
 #endif
 
+		// Sky culling
+		if (!gr_curline->polyseg) // Don't do it for polyobjects
+		{
+			// Sky Ceilings
+			wallVerts[3].y = wallVerts[2].y = FIXED_TO_FLOAT(INT32_MAX);
+
+			if (gr_frontsector->ceilingpic == skyflatnum)
+			{
+				if (gr_backsector->ceilingpic == skyflatnum)
+				{
+					// Both front and back sectors are sky, needs skywall from the frontsector's ceiling, but only if the
+					// backsector is lower
+					if ((worldhigh <= worldtop)
+#ifdef ESLOPE
+					&& (worldhighslope <= worldtopslope)
+#endif
+					)
+					{
+#ifdef ESLOPE
+						wallVerts[0].y = FIXED_TO_FLOAT(worldhigh);
+						wallVerts[1].y = FIXED_TO_FLOAT(worldhighslope);
+#else
+						wallVerts[0].y = wallVerts[1].y = FIXED_TO_FLOAT(worldhigh);
+#endif
+						HWR_DrawSkyWall(wallVerts, &Surf);
+					}
+				}
+				else
+				{
+					// Only the frontsector is sky, just draw a skywall from the front ceiling
+#ifdef ESLOPE
+					wallVerts[0].y = FIXED_TO_FLOAT(worldtop);
+					wallVerts[1].y = FIXED_TO_FLOAT(worldtopslope);
+#else
+					wallVerts[0].y = wallVerts[1].y = FIXED_TO_FLOAT(worldtop);
+#endif
+					HWR_DrawSkyWall(wallVerts, &Surf);
+				}
+			}
+			else if (gr_backsector->ceilingpic == skyflatnum)
+			{
+				// Only the backsector is sky, just draw a skywall from the front ceiling
+#ifdef ESLOPE
+				wallVerts[0].y = FIXED_TO_FLOAT(worldtop);
+				wallVerts[1].y = FIXED_TO_FLOAT(worldtopslope);
+#else
+				wallVerts[0].y = wallVerts[1].y = FIXED_TO_FLOAT(worldtop);
+#endif
+				HWR_DrawSkyWall(wallVerts, &Surf);
+			}
+
+
+			// Sky Floors
+			wallVerts[0].y = wallVerts[1].y = FIXED_TO_FLOAT(INT32_MIN);
+
+			if (gr_frontsector->floorpic == skyflatnum)
+			{
+				if (gr_backsector->floorpic == skyflatnum)
+				{
+					// Both front and back sectors are sky, needs skywall from the backsector's floor, but only if the
+					// it's higher, also needs to check for bottomtexture as the floors don't usually move down
+					// when both sides are sky floors
+					if ((worldlow >= worldbottom)
+#ifdef ESLOPE
+					&& (worldlowslope >= worldbottomslope)
+#endif
+					&& !(gr_sidedef->bottomtexture))
+					{
+#ifdef ESLOPE
+						wallVerts[3].y = FIXED_TO_FLOAT(worldlow);
+						wallVerts[2].y = FIXED_TO_FLOAT(worldlowslope);
+#else
+						wallVerts[3].y = wallVerts[2].y = FIXED_TO_FLOAT(worldlow);
+#endif
+
+						HWR_DrawSkyWall(wallVerts, &Surf);
+					}
+				}
+				else
+				{
+					// Only the backsector has sky, just draw a skywall from the back floor
+#ifdef ESLOPE
+					wallVerts[3].y = FIXED_TO_FLOAT(worldbottom);
+					wallVerts[2].y = FIXED_TO_FLOAT(worldbottomslope);
+#else
+					wallVerts[3].y = wallVerts[2].y = FIXED_TO_FLOAT(worldbottom);
+#endif
+
+					HWR_DrawSkyWall(wallVerts, &Surf);
+				}
+			}
+			else if ((gr_backsector->floorpic == skyflatnum) && !(gr_sidedef->bottomtexture))
+			{
+				// Only the backsector has sky, just draw a skywall from the back floor if there's no bottomtexture
+#ifdef ESLOPE
+				wallVerts[3].y = FIXED_TO_FLOAT(worldlow);
+				wallVerts[2].y = FIXED_TO_FLOAT(worldlowslope);
+#else
+				wallVerts[3].y = wallVerts[2].y = FIXED_TO_FLOAT(worldlow);
+#endif
+
+				HWR_DrawSkyWall(wallVerts, &Surf);
+			}
+		}
+
 		// hack to allow height changes in outdoor areas
 		// This is what gets rid of the upper textures if there should be sky
 		if (gr_frontsector->ceilingpic == skyflatnum &&
@@ -1914,85 +2016,6 @@ static void HWR_StoreWallRange(double startfrac, double endfrac)
 				Surf.FlatColor.rgba = 0xffffffff;
 			}*/
 		}
-
-		// Isn't this just the most lovely mess
-		if (!gr_curline->polyseg) // Don't do it for polyobjects
-		{
-			if (gr_frontsector->ceilingpic == skyflatnum || gr_backsector->ceilingpic == skyflatnum)
-			{
-				fixed_t depthwallheight;
-
-				if (!gr_sidedef->toptexture || (gr_frontsector->ceilingpic == skyflatnum && gr_backsector->ceilingpic == skyflatnum)) // when both sectors are sky, the top texture isn't drawn
-					depthwallheight = gr_frontsector->ceilingheight < gr_backsector->ceilingheight ? gr_frontsector->ceilingheight : gr_backsector->ceilingheight;
-				else
-					depthwallheight = gr_frontsector->ceilingheight > gr_backsector->ceilingheight ? gr_frontsector->ceilingheight : gr_backsector->ceilingheight;
-
-				if (gr_frontsector->ceilingheight-gr_frontsector->floorheight <= 0) // current sector is a thok barrier
-				{
-					if (gr_backsector->ceilingheight-gr_backsector->floorheight <= 0) // behind sector is also a thok barrier
-					{
-						if (!gr_sidedef->bottomtexture) // Only extend further down if there's no texture
-							HWR_DrawSkyWall(wallVerts, &Surf, worldbottom < worldlow ? worldbottom : worldlow, INT32_MAX);
-						else
-							HWR_DrawSkyWall(wallVerts, &Surf, worldbottom > worldlow ? worldbottom : worldlow, INT32_MAX);
-					}
-					// behind sector is not a thok barrier
-					else if (gr_backsector->ceilingheight <= gr_frontsector->ceilingheight) // behind sector ceiling is lower or equal to current sector
-						HWR_DrawSkyWall(wallVerts, &Surf, depthwallheight, INT32_MAX);
-						// gr_front/backsector heights need to be used here because of the worldtop being set to worldhigh earlier on
-				}
-				else if (gr_backsector->ceilingheight-gr_backsector->floorheight <= 0) // behind sector is a thok barrier, current sector is not
-				{
-					if (gr_backsector->ceilingheight >= gr_frontsector->ceilingheight // thok barrier ceiling height is equal to or greater than current sector ceiling height
-						|| gr_backsector->floorheight <= gr_frontsector->floorheight // thok barrier ceiling height is equal to or less than current sector floor height
-						|| gr_backsector->ceilingpic != skyflatnum) // thok barrier is not a sky
-						HWR_DrawSkyWall(wallVerts, &Surf, depthwallheight, INT32_MAX);
-				}
-				else // neither sectors are thok barriers
-				{
-					if ((gr_backsector->ceilingheight < gr_frontsector->ceilingheight && !gr_sidedef->toptexture) // no top texture and sector behind is lower
-						|| gr_backsector->ceilingpic != skyflatnum) // behind sector is not a sky
-						HWR_DrawSkyWall(wallVerts, &Surf, depthwallheight, INT32_MAX);
-				}
-			}
-			// And now for sky floors!
-			if (gr_frontsector->floorpic == skyflatnum || gr_backsector->floorpic == skyflatnum)
-			{
-				fixed_t depthwallheight;
-
-				if (!gr_sidedef->bottomtexture)
-					depthwallheight = worldbottom > worldlow ? worldbottom : worldlow;
-				else
-					depthwallheight = worldbottom < worldlow ? worldbottom : worldlow;
-
-				if (gr_frontsector->ceilingheight-gr_frontsector->floorheight <= 0) // current sector is a thok barrier
-				{
-					if (gr_backsector->ceilingheight-gr_backsector->floorheight <= 0) // behind sector is also a thok barrier
-					{
-						if (!gr_sidedef->toptexture) // Only extend up if there's no texture
-							HWR_DrawSkyWall(wallVerts, &Surf, INT32_MIN, worldtop > worldhigh ? worldtop : worldhigh);
-						else
-							HWR_DrawSkyWall(wallVerts, &Surf, INT32_MIN, worldtop < worldhigh ? worldtop : worldhigh);
-					}
-					// behind sector is not a thok barrier
-					else if (gr_backsector->floorheight >= gr_frontsector->floorheight) // behind sector floor is greater or equal to current sector
-						HWR_DrawSkyWall(wallVerts, &Surf, INT32_MIN, depthwallheight);
-				}
-				else if (gr_backsector->ceilingheight-gr_backsector->floorheight <= 0) // behind sector is a thok barrier, current sector is not
-				{
-					if (gr_backsector->floorheight <= gr_frontsector->floorheight // thok barrier floor height is equal to or less than current sector floor height
-						|| gr_backsector->ceilingheight >= gr_frontsector->ceilingheight // thok barrier floor height is equal to or greater than current sector ceiling height
-						|| gr_backsector->floorpic != skyflatnum) // thok barrier is not a sky
-						HWR_DrawSkyWall(wallVerts, &Surf, INT32_MIN, depthwallheight);
-				}
-				else // neither sectors are thok barriers
-				{
-					if ((gr_backsector->floorheight > gr_frontsector->floorheight && !gr_sidedef->bottomtexture) // no bottom texture and sector behind is higher
-						|| gr_backsector->floorpic != skyflatnum) // behind sector is not a sky
-						HWR_DrawSkyWall(wallVerts, &Surf, INT32_MIN, depthwallheight);
-				}
-			}
-		}
 	}
 	else
 	{
@@ -2060,13 +2083,52 @@ static void HWR_StoreWallRange(double startfrac, double endfrac)
 					HWR_ProjectWall(wallVerts, &Surf, PF_Masked, lightnum, colormap);
 			}
 		}
+		else
+		{
+#ifdef ESLOPE
+			//Set textures properly on single sided walls that are sloped
+			wallVerts[3].y = FIXED_TO_FLOAT(worldtop);
+			wallVerts[0].y = FIXED_TO_FLOAT(worldbottom);
+			wallVerts[2].y = FIXED_TO_FLOAT(worldtopslope);
+			wallVerts[1].y = FIXED_TO_FLOAT(worldbottomslope);
+#else
+			// set top/bottom coords
+			wallVerts[2].y = wallVerts[3].y = FIXED_TO_FLOAT(worldtop);
+			wallVerts[0].y = wallVerts[1].y = FIXED_TO_FLOAT(worldbottom);
+#endif
 
+			// When there's no midtexture, draw a skywall to prevent rendering behind it
+			HWR_DrawSkyWall(wallVerts, &Surf);
+		}
+
+
+		// Single sided lines are simple for skywalls, just need to draw from the top or bottom of the sector if there's
+		// a sky flat
 		if (!gr_curline->polyseg)
 		{
 			if (gr_frontsector->ceilingpic == skyflatnum) // It's a single-sided line with sky for its sector
-				HWR_DrawSkyWall(wallVerts, &Surf, worldtop, INT32_MAX);
+			{
+				wallVerts[3].y = wallVerts[2].y = FIXED_TO_FLOAT(INT32_MAX);
+#ifdef ESLOPE
+				wallVerts[0].y = FIXED_TO_FLOAT(worldtop);
+				wallVerts[1].y = FIXED_TO_FLOAT(worldtopslope);
+#else
+				wallVerts[0].y = wallVerts[1].y = FIXED_TO_FLOAT(worldtop);
+#endif
+				HWR_DrawSkyWall(wallVerts, &Surf);
+			}
 			if (gr_frontsector->floorpic == skyflatnum)
-				HWR_DrawSkyWall(wallVerts, &Surf, INT32_MIN, worldbottom);
+			{
+#ifdef ESLOPE
+				wallVerts[3].y = FIXED_TO_FLOAT(worldbottom);
+				wallVerts[2].y = FIXED_TO_FLOAT(worldbottomslope);
+#else
+				wallVerts[3].y = wallVerts[2].y = FIXED_TO_FLOAT(worldbottom);
+#endif
+				wallVerts[0].y = wallVerts[1].y = FIXED_TO_FLOAT(INT32_MIN);
+
+				HWR_DrawSkyWall(wallVerts, &Surf);
+			}
 		}
 	}
 
@@ -2381,7 +2443,7 @@ static void HWR_StoreWallRange(double startfrac, double endfrac)
 // e6y: Check whether the player can look beyond this line
 //
 #ifdef NEWCLIP
-boolean checkforemptylines = true;
+static boolean checkforemptylines = true;
 // Don't modify anything here, just check
 // Kalaron: Modified for sloped linedefs
 static boolean CheckClip(seg_t * seg, sector_t * afrontsector, sector_t * abacksector)
@@ -2421,62 +2483,47 @@ static boolean CheckClip(seg_t * seg, sector_t * afrontsector, sector_t * abacks
 		backc1 = backc2 = abacksector->ceilingheight;
 	}
 
-	// now check for closed sectors!
-	if (backc1 <= frontf1 && backc2 <= frontf2)
+	if (viewsector != abacksector && viewsector != afrontsector)
 	{
-		checkforemptylines = false;
-		if (!seg->sidedef->toptexture)
-			return false;
+		boolean mydoorclosed = false; // My door? Closed!? (doorclosed is actually otherwise unused in openGL)
 
-		if (abacksector->ceilingpic == skyflatnum && afrontsector->ceilingpic == skyflatnum)
-			return false;
-
-		return true;
-	}
-
-	if (backf1 >= frontc1 && backf2 >= frontc2)
-	{
-		checkforemptylines = false;
-		if (!seg->sidedef->bottomtexture)
-			return false;
-
-		// properly render skies (consider door "open" if both floors are sky):
-		if (abacksector->ceilingpic == skyflatnum && afrontsector->ceilingpic == skyflatnum)
-			return false;
-
-		return true;
-	}
-
-	if (backc1 <= backf1 && backc2 <= backf2)
-	{
-		checkforemptylines = false;
-		// preserve a kind of transparent door/lift special effect:
-		if (backc1 < frontc1 || backc2 < frontc2)
-		{
-			if (!seg->sidedef->toptexture)
-				return false;
-		}
-		if (backf1 > frontf1 || backf2 > frontf2)
-		{
-			if (!seg->sidedef->bottomtexture)
-				return false;
-		}
-		if (abacksector->ceilingpic == skyflatnum && afrontsector->ceilingpic == skyflatnum)
-			return false;
-
-		if (abacksector->floorpic == skyflatnum && afrontsector->floorpic == skyflatnum)
-			return false;
-
-		return true;
-	}
-
-	if (backc1 != frontc1 || backc2 != frontc2
-		|| backf1 != frontf1 || backf2 != frontf2)
+		// If the sector behind the line blocks all kinds of view past it
+		// (back ceiling is lower than close floor, or back floor is higher than close ceiling)
+		if ((backc1 <= frontf1 && backc2 <= frontf2)
+			|| (backf1 >= frontc1 && backf2 >= frontc2))
 		{
 			checkforemptylines = false;
-			return false;
+			return true;
 		}
 
+		// The door is closed if:
+		// backsector is 0 height or less and
+		// back ceiling is higher than close ceiling or we need to render a top texture and
+		// back floor is lower than close floor or we need to render a bottom texture and
+		// neither front or back sectors are using the sky ceiling
+		mydoorclosed = (backc1 <= backf1 && backc2 <= backf2
+		&& ((backc1 >= frontc1 && backc2 >= frontc2) || seg->sidedef->toptexture)
+		&& ((backf1 <= frontf1 && backf2 >= frontf2) || seg->sidedef->bottomtexture)
+		&& (abacksector->ceilingpic != skyflatnum || afrontsector->ceilingpic != skyflatnum));
+
+		if (mydoorclosed)
+		{
+			checkforemptylines = false;
+			return true;
+		}
+	}
+
+	// Window.
+	// We know it's a window when the above isn't true and the back and front sectors don't match
+	if (backc1 != frontc1 || backc2 != frontc2
+		|| backf1 != frontf1 || backf2 != frontf2)
+	{
+		checkforemptylines = false;
+		return false;
+	}
+
+	// In this case we just need to check whether there is actually a need to render any lines, so checkforempty lines
+	// stays true
 	return false;
 }
 #else
@@ -5470,7 +5517,7 @@ static void HWR_AddSprites(sector_t *sec)
 	}
 
 #ifdef HWPRECIP
-	// Someone seriously wants infinite draw distance for precipitation?
+	// No to infinite precipitation draw distance.
 	if ((limit_dist = (fixed_t)cv_drawdist_precip.value << FRACBITS))
 	{
 		for (precipthing = sec->preciplist; precipthing; precipthing = precipthing->snext)
@@ -5486,13 +5533,6 @@ static void HWR_AddSprites(sector_t *sec)
 			HWR_ProjectPrecipitationSprite(precipthing);
 		}
 	}
-	else
-	{
-		// Draw everything in sector, no checks
-		for (precipthing = sec->preciplist; precipthing; precipthing = precipthing->snext)
-			if (!(precipthing->precipflags & PCF_INVISIBLE))
-				HWR_ProjectPrecipitationSprite(precipthing);
-	}
 #endif
 }
 
diff --git a/src/i_tcp.c b/src/i_tcp.c
index fb0e5852..f58aa22b 100644
--- a/src/i_tcp.c
+++ b/src/i_tcp.c
@@ -1311,7 +1311,7 @@ static SINT8 SOCK_NetMakeNodewPort(const char *address, const char *port)
 	int gaie;
 
 	 if (!port || !port[0])
-		port = port_name;
+		port = DEFAULTPORT;
 
 	DEBFILE(va("Creating new node: %s@%s\n", address, port));
 
diff --git a/src/m_menu.c b/src/m_menu.c
index 9b5e98e4..97b1ce9b 100644
--- a/src/m_menu.c
+++ b/src/m_menu.c
@@ -522,7 +522,7 @@ static menuitem_t PlaybackMenu[] =
 
 	{IT_CALL   | IT_STRING, "M_PREW",   "Rewind",        M_PlaybackRewind,      20},
 	{IT_CALL   | IT_STRING, "M_PPAUSE", "Pause",         M_PlaybackPause,       36},
-	{IT_CALL   | IT_STRING, "M_PFFWD",  "Fast-Foward",   M_PlaybackFastForward, 52},
+	{IT_CALL   | IT_STRING, "M_PFFWD",  "Fast-Forward",  M_PlaybackFastForward, 52},
 	{IT_CALL   | IT_STRING, "M_PSTEPB", "Backup Frame",  M_PlaybackRewind,      20},
 	{IT_CALL   | IT_STRING, "M_PRESUM", "Resume",        M_PlaybackPause,       36},
 	{IT_CALL   | IT_STRING, "M_PFADV",  "Advance Frame", M_PlaybackAdvance,     52},
@@ -8432,7 +8432,11 @@ static void M_ConnectMenu(INT32 choice)
 	// first page of servers
 	serverlistpage = 0;
 	if (ms_RoomId < 0)
+	{
 		M_RoomMenu(0); // Select a room instead of staring at an empty list
+		// This prevents us from returning to the modified game alert.
+		currentMenu->prevMenu = &MP_MainDef;
+	}
 	else
 		M_SetupNextMenu(&MP_ConnectDef);
 	itemOn = 0;
diff --git a/src/mserv.c b/src/mserv.c
index 29aa99fa..c7344b16 100644
--- a/src/mserv.c
+++ b/src/mserv.c
@@ -661,19 +661,11 @@ FUNCMATH static const char *int2str(INT32 n)
 #ifndef NONET
 static INT32 ConnectionFailed(void)
 {
-	time(&MSLastPing);
 	con_state = MSCS_FAILED;
 	CONS_Alert(CONS_ERROR, M_GetText("Connection to Master Server failed\n"));
 	CloseConnection();
 	return MS_CONNECT_ERROR;
 }
-
-static INT32 ConnectionFailedwerrno(int no)
-{
-	CONS_Alert(CONS_ERROR, M_GetText("Master Server socket error: %s\n"),
-			strerror(no));
-	return ConnectionFailed();
-}
 #endif
 
 /** Tries to register the local game server on the master server.
@@ -690,43 +682,57 @@ static INT32 AddToMasterServer(boolean firstadd)
 	msg_server_t *info = (msg_server_t *)msg.buffer;
 	INT32 room = -1;
 	fd_set tset;
+	time_t timestamp = time(NULL);
 	UINT32 signature, tmp;
 	const char *insname;
 
-	if (socket_fd == (SOCKET_TYPE)ERRSOCKET)/* Woah, our socket was closed! */
-	{
-		if (MS_Connect(GetMasterServerIP(), GetMasterServerPort(), 0))
-			return ConnectionFailedwerrno(errno);
-	}
-
 	M_Memcpy(&tset, &wset, sizeof (tset));
 	res = select(255, NULL, &tset, NULL, &select_timeout);
-	if (res == ERRSOCKET)
-		return ConnectionFailedwerrno(errno);
-	if (res == 0)/* nothing selected */
+	if (res != ERRSOCKET && !res)
 	{
-		/*
-		Timeout next call because SendPingToMasterServer
-		(our calling function) already calls this once
-		every two minutes.
-		*/
-		if (retry++ == 1)
+		if (retry++ > 30) // an about 30 second timeout
 		{
 			retry = 0;
 			CONS_Alert(CONS_ERROR, M_GetText("Master Server timed out\n"));
+			MSLastPing = timestamp;
 			return ConnectionFailed();
 		}
 		return MS_CONNECT_ERROR;
 	}
 	retry = 0;
+	/*
+	Somehow we can still select our old socket despite it being closed(?).
+	Atleast, that's what I THINK is happening. Anyway, we have to check that we
+	haven't open a socket, and actually open it!
+	*/
+	/*if (res == ERRSOCKET)*//* wtf? no! */
+	if (socket_fd == (SOCKET_TYPE)ERRSOCKET)
+	{
+		if (MS_Connect(GetMasterServerIP(), GetMasterServerPort(), 0))
+		{
+			CONS_Alert(CONS_ERROR, M_GetText("Master Server socket error #%u: %s\n"), errno, strerror(errno));
+			MSLastPing = timestamp;
+			return ConnectionFailed();
+		}
+	}
 
 	// so, the socket is writable, but what does that mean, that the connection is
 	// ok, or bad... let see that!
 	j = (socklen_t)sizeof (i);
-	if (getsockopt(socket_fd, SOL_SOCKET, SO_ERROR, (char *)&i, &j) == ERRSOCKET)
-		return ConnectionFailedwerrno(errno);
+	getsockopt(socket_fd, SOL_SOCKET, SO_ERROR, (char *)&i, &j);
+	/*
+	This is also wrong. If getsockopt fails, i doesn't have to be set. Plus, if
+	it is set (which it appearantly is on linux), we check errno anyway. And in
+	the case that i is returned as normal, we don't even report the correct
+	value! So we accomplish NOTHING, except returning due to dumb luck.
+	If you care, fix this--I don't. -James (R.)
+	*/
 	if (i) // it was bad
-		return ConnectionFailedwerrno(i);
+	{
+		CONS_Alert(CONS_ERROR, M_GetText("Master Server socket error #%u: %s\n"), errno, strerror(errno));
+		MSLastPing = timestamp;
+		return ConnectionFailed();
+	}
 
 #ifdef PARANOIA
 	if (ms_RoomId <= 0)
@@ -759,12 +765,15 @@ static INT32 AddToMasterServer(boolean firstadd)
 	msg.length = (UINT32)sizeof (msg_server_t);
 	msg.room = 0;
 	if (MS_Write(&msg) < 0)
+	{
+		MSLastPing = timestamp;
 		return ConnectionFailed();
+	}
 
 	if(con_state != MSCS_REGISTERED)
 		CONS_Printf(M_GetText("Master Server update successful.\n"));
 
-	time(&MSLastPing);
+	MSLastPing = timestamp;
 	con_state = MSCS_REGISTERED;
 	CloseConnection();
 #endif