diff --git a/src/d_clisrv.c b/src/d_clisrv.c
index 43321d92d..ed0b8e528 100644
--- a/src/d_clisrv.c
+++ b/src/d_clisrv.c
@@ -1690,7 +1690,7 @@ static void CL_LoadReceivedSavegame(void)
 	// load a base level
 	if (P_LoadNetGame())
 	{
-		const INT32 actnum = mapheaderinfo[gamemap-1]->actnum;
+		const UINT8 actnum = mapheaderinfo[gamemap-1]->actnum;
 		CONS_Printf(M_GetText("Map is now \"%s"), G_BuildMapName(gamemap));
 		if (strcmp(mapheaderinfo[gamemap-1]->lvlttl, ""))
 		{
diff --git a/src/d_main.c b/src/d_main.c
index dd25596e1..a779aa0bf 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -125,6 +125,9 @@ boolean advancedemo;
 INT32 debugload = 0;
 #endif
 
+char savegamename[256];
+char liveeventbackup[256];
+
 char srb2home[256] = ".";
 char srb2path[256] = ".";
 boolean usehome = true;
diff --git a/src/d_player.h b/src/d_player.h
index 8697e9836..e5c7e7298 100644
--- a/src/d_player.h
+++ b/src/d_player.h
@@ -239,7 +239,8 @@ typedef enum
 	CR_MACESPIN,
 	CR_MINECART,
 	CR_ROLLOUT,
-	CR_PTERABYTE
+	CR_PTERABYTE,
+	CR_DUSTDEVIL
 } carrytype_t; // pw_carry
 
 // Player powers. (don't edit this comment)
diff --git a/src/dehacked.c b/src/dehacked.c
index a6ef8dae7..ff3e118c4 100644
--- a/src/dehacked.c
+++ b/src/dehacked.c
@@ -1557,7 +1557,7 @@ static void readlevelheader(MYFILE *f, INT32 num)
 			}
 			else if (fastcmp(word, "ACT"))
 			{
-				if (i >= 0 && i < 20) // 0 for no act number, TTL1 through TTL19
+				if (i >= 0 && i <= 99) // 0 for no act number
 					mapheaderinfo[num-1]->actnum = (UINT8)i;
 				else
 					deh_warning("Level header %d: invalid act number %d", num, i);
@@ -9521,6 +9521,7 @@ struct {
 	{"CR_MINECART",CR_MINECART},
 	{"CR_ROLLOUT",CR_ROLLOUT},
 	{"CR_PTERABYTE",CR_PTERABYTE},
+	{"CR_DUSTDEVIL",CR_DUSTDEVIL},
 
 	// Ring weapons (ringweapons_t)
 	// Useful for A_GiveWeapon
diff --git a/src/doomdef.h b/src/doomdef.h
index d5f420e3e..d8ce020c5 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -458,8 +458,8 @@ void CONS_Debug(INT32 debugflags, const char *fmt, ...) FUNCDEBUG;
 
 // Things that used to be in dstrings.h
 #define SAVEGAMENAME "srb2sav"
-char savegamename[256];
-char liveeventbackup[256];
+extern char savegamename[256];
+extern char liveeventbackup[256];
 
 // m_misc.h
 #ifdef GETTEXT
diff --git a/src/doomstat.h b/src/doomstat.h
index 7ef4c7f32..f407d7add 100644
--- a/src/doomstat.h
+++ b/src/doomstat.h
@@ -557,7 +557,7 @@ extern recorddata_t *mainrecords[NUMMAPS];
 extern UINT8 mapvisited[NUMMAPS];
 
 // Temporary holding place for nights data for the current map
-nightsdata_t ntemprecords;
+extern nightsdata_t ntemprecords;
 
 extern UINT32 token; ///< Number of tokens collected in a level
 extern UINT32 tokenlist; ///< List of tokens collected
diff --git a/src/g_game.c b/src/g_game.c
index 5baa257d3..e6a6d851c 100644
--- a/src/g_game.c
+++ b/src/g_game.c
@@ -4681,7 +4681,7 @@ char *G_BuildMapTitle(INT32 mapnum)
 	{
 		size_t len = 1;
 		const char *zonetext = NULL;
-		const INT32 actnum = mapheaderinfo[mapnum-1]->actnum;
+		const UINT8 actnum = mapheaderinfo[mapnum-1]->actnum;
 
 		len += strlen(mapheaderinfo[mapnum-1]->lvlttl);
 		if (!(mapheaderinfo[mapnum-1]->levelflags & LF_NOZONE))
diff --git a/src/hu_stuff.c b/src/hu_stuff.c
index 6aa5a4510..3ff9db2b6 100644
--- a/src/hu_stuff.c
+++ b/src/hu_stuff.c
@@ -68,7 +68,7 @@ patch_t *nightsnum[10]; // 0-9
 // Level title and credits fonts
 patch_t *lt_font[LT_FONTSIZE];
 patch_t *cred_font[CRED_FONTSIZE];
-patch_t *ttlnum[20]; // act numbers (0-19)
+patch_t *ttlnum[10]; // act numbers (0-9)
 
 // Name tag fonts
 patch_t *ntb_font[NT_FONTSIZE];
@@ -243,7 +243,7 @@ void HU_LoadGraphics(void)
 	tallinfin = (patch_t *)W_CachePatchName("STTINFIN", PU_HUDGFX);
 
 	// cache act numbers for level titles
-	for (i = 0; i < 20; i++)
+	for (i = 0; i < 10; i++)
 	{
 		sprintf(buffer, "TTL%.2d", i);
 		ttlnum[i] = (patch_t *)W_CachePatchName(buffer, PU_HUDGFX);
diff --git a/src/hu_stuff.h b/src/hu_stuff.h
index 9e3c66747..63d85f1b8 100644
--- a/src/hu_stuff.h
+++ b/src/hu_stuff.h
@@ -85,7 +85,7 @@ extern patch_t *lt_font[LT_FONTSIZE];
 extern patch_t *cred_font[CRED_FONTSIZE];
 extern patch_t *ntb_font[NT_FONTSIZE];
 extern patch_t *nto_font[NT_FONTSIZE];
-extern patch_t *ttlnum[20];
+extern patch_t *ttlnum[10];
 extern patch_t *emeraldpics[3][8];
 extern patch_t *rflagico;
 extern patch_t *bflagico;
diff --git a/src/m_anigif.c b/src/m_anigif.c
index ce2ca20b9..1b71a09bc 100644
--- a/src/m_anigif.c
+++ b/src/m_anigif.c
@@ -490,29 +490,28 @@ const UINT8 gifframe_gchead[4] = {0x21,0xF9,0x04,0x04}; // GCE, bytes, packed by
 static UINT8 *gifframe_data = NULL;
 static size_t gifframe_size = 8192;
 
+//
+// GIF_rgbconvert
+// converts an RGB frame to a frame with a palette.
+//
 #ifdef HWRENDER
-static void hwrconvert(void)
+static void GIF_rgbconvert(UINT8 *linear, UINT8 *scr)
 {
-	UINT8 *linear = HWR_GetScreenshot();
-	UINT8 *dest = screens[2];
 	UINT8 r, g, b;
-	INT32 x, y;
-	size_t i = 0;
+	size_t src = 0, dest = 0;
+	size_t size = (vid.width * vid.height * 3);
 
 	InitColorLUT(gif_framepalette);
 
-	for (y = 0; y < vid.height; y++)
+	while (src < size)
 	{
-		for (x = 0; x < vid.width; x++, i += 3)
-		{
-			r = (UINT8)linear[i];
-			g = (UINT8)linear[i + 1];
-			b = (UINT8)linear[i + 2];
-			dest[(y * vid.width) + x] = colorlookup[r >> SHIFTCOLORBITS][g >> SHIFTCOLORBITS][b >> SHIFTCOLORBITS];
-		}
+		r = (UINT8)linear[src];
+		g = (UINT8)linear[src + 1];
+		b = (UINT8)linear[src + 2];
+		scr[dest] = colorlookup[r >> SHIFTCOLORBITS][g >> SHIFTCOLORBITS][b >> SHIFTCOLORBITS];
+		src += (3 * scrbuf_downscaleamt);
+		dest += scrbuf_downscaleamt;
 	}
-
-	free(linear);
 }
 #endif
 
@@ -556,7 +555,11 @@ static void GIF_framewrite(void)
 			I_ReadScreen(movie_screen);
 #ifdef HWRENDER
 		else if (rendermode == render_opengl)
-			hwrconvert();
+		{
+			UINT8 *linear = HWR_GetScreenshot();
+			GIF_rgbconvert(linear, movie_screen);
+			free(linear);
+		}
 #endif
 	}
 	else
@@ -565,18 +568,20 @@ static void GIF_framewrite(void)
 		blitw = vid.width;
 		blith = vid.height;
 
-		if (gif_frames == 0)
-		{
-			if (rendermode == render_soft)
-				I_ReadScreen(movie_screen);
 #ifdef HWRENDER
-			else if (rendermode == render_opengl)
-			{
-				hwrconvert();
-				VID_BlitLinearScreen(screens[2], screens[0], vid.width*vid.bpp, vid.height, vid.width*vid.bpp, vid.rowbytes);
-			}
-#endif
+		// Copy the current OpenGL frame into the base screen
+		if (rendermode == render_opengl)
+		{
+			UINT8 *linear = HWR_GetScreenshot();
+			GIF_rgbconvert(linear, screens[0]);
+			free(linear);
 		}
+#endif
+
+		// Copy the first frame into the movie screen
+		// OpenGL already does the same above.
+		if (gif_frames == 0 && rendermode == render_soft)
+			I_ReadScreen(movie_screen);
 
 		movie_screen = screens[0];
 	}
diff --git a/src/m_menu.c b/src/m_menu.c
index 7a17fe302..fae17608b 100644
--- a/src/m_menu.c
+++ b/src/m_menu.c
@@ -5237,7 +5237,7 @@ static boolean M_PrepareLevelPlatter(INT32 gt, boolean nextmappick)
 	{
 		if (M_CanShowLevelOnPlatter(mapnum, gt))
 		{
-			const INT32 actnum = mapheaderinfo[mapnum]->actnum;
+			const UINT8 actnum = mapheaderinfo[mapnum]->actnum;
 			const boolean headingisname = (fastcmp(mapheaderinfo[mapnum]->selectheading, mapheaderinfo[mapnum]->lvlttl));
 			const boolean wide = (mapheaderinfo[mapnum]->menuflags & LF2_WIDEICON);
 
diff --git a/src/mserv.h b/src/mserv.h
index 6d91da643..5f9b8da5f 100644
--- a/src/mserv.h
+++ b/src/mserv.h
@@ -68,7 +68,7 @@ extern consvar_t cv_masterserver, cv_servername;
 // < 0 to not connect (usually -1) (offline mode)
 // == 0 to show all rooms, not a valid hosting room
 // anything else is whatever room the MS assigns to that number (online mode)
-INT16 ms_RoomId;
+extern INT16 ms_RoomId;
 
 const char *GetMasterServerPort(void);
 const char *GetMasterServerIP(void);
diff --git a/src/p_enemy.c b/src/p_enemy.c
index 246ca1321..8fbf5baa6 100644
--- a/src/p_enemy.c
+++ b/src/p_enemy.c
@@ -13369,8 +13369,9 @@ static boolean PIT_DustDevilLaunch(mobj_t *thing)
 				P_ResetPlayer(player);
 				A_PlayActiveSound(dustdevil);
 			}
+			player->powers[pw_carry] = CR_DUSTDEVIL;
 			player->powers[pw_nocontrol] = 2;
-			player->drawangle += ANG20;
+			P_SetTarget(&thing->tracer, dustdevil);
 			P_SetPlayerMobjState(thing, S_PLAY_PAIN);
 
 			if (dist > dragamount)
@@ -13390,7 +13391,9 @@ static boolean PIT_DustDevilLaunch(mobj_t *thing)
 			P_ResetPlayer(player);
 			thing->z = dustdevil->z + dustdevil->height;
 			thrust = 20 * FRACUNIT;
+			player->powers[pw_carry] = CR_NONE;
 			player->powers[pw_nocontrol] = 0;
+			P_SetTarget(&thing->tracer, NULL);
 			S_StartSound(thing, sfx_wdjump);
 			P_SetPlayerMobjState(thing, S_PLAY_FALL);
 		}
diff --git a/src/p_user.c b/src/p_user.c
index f5c8caf72..5dfed642d 100644
--- a/src/p_user.c
+++ b/src/p_user.c
@@ -11918,6 +11918,9 @@ void P_PlayerThink(player_t *player)
 						factor = 4;
 					}
 					break;
+				case CR_DUSTDEVIL:
+					player->drawangle += ANG20;
+					break;
 				/* -- in case we wanted to have the camera freely movable during zoom tubes
 				case CR_ZOOMTUBE:*/
 				case CR_ROPEHANG:
@@ -12690,6 +12693,19 @@ void P_PlayerAfterThink(player_t *player)
 				}
 				break;
 			}
+			case CR_DUSTDEVIL:
+			{
+				mobj_t *mo = player->mo, *dustdevil = player->mo->tracer;
+
+				if (abs(mo->x - dustdevil->x) > dustdevil->radius || abs(mo->y - dustdevil->y) > dustdevil->radius)
+				{
+					P_SetTarget(&player->mo->tracer, NULL);
+					player->powers[pw_carry] = CR_NONE;
+					break;
+				}
+
+				break;
+			}
 			case CR_ROLLOUT:
 			{
 				mobj_t *mo = player->mo, *rock = player->mo->tracer;
diff --git a/src/s_sound.c b/src/s_sound.c
index d108363eb..5ed9fd83a 100644
--- a/src/s_sound.c
+++ b/src/s_sound.c
@@ -134,6 +134,7 @@ consvar_t cv_playmusicifunfocused = {"playmusicifunfocused", "No", CV_SAVE, CV_Y
 consvar_t cv_playsoundsifunfocused = {"playsoundsifunfocused", "No", CV_SAVE, CV_YesNo, NULL, 0, NULL, NULL, 0, 0, NULL};
 
 #ifdef HAVE_OPENMPT
+openmpt_module *openmpt_mhandle = NULL;
 static CV_PossibleValue_t interpolationfilter_cons_t[] = {{0, "Default"}, {1, "None"}, {2, "Linear"}, {4, "Cubic"}, {8, "Windowed sinc"}, {0, NULL}};
 consvar_t cv_modfilter = {"modfilter", "0", CV_SAVE|CV_CALL, interpolationfilter_cons_t, ModFilter_OnChange, 0, NULL, NULL, 0, 0, NULL};
 #endif
@@ -1910,6 +1911,10 @@ UINT32 S_GetMusicPosition(void)
 /// In this section: mazmazz doesn't know how to do dynamic arrays or struct pointers!
 /// ------------------------
 
+char music_stack_nextmusname[7];
+boolean music_stack_noposition = false;
+UINT32 music_stack_fadeout = 0;
+UINT32 music_stack_fadein = 0;
 static musicstack_t *music_stacks = NULL;
 static musicstack_t *last_music_stack = NULL;
 
diff --git a/src/s_sound.h b/src/s_sound.h
index 119722af4..3334fcb69 100644
--- a/src/s_sound.h
+++ b/src/s_sound.h
@@ -22,7 +22,7 @@
 
 #ifdef HAVE_OPENMPT
 #include "libopenmpt/libopenmpt.h"
-openmpt_module *openmpt_mhandle;
+extern openmpt_module *openmpt_mhandle;
 #endif
 
 // mask used to indicate sound origin is player item pickup
@@ -262,10 +262,10 @@ typedef struct musicstack_s
     struct musicstack_s *next;
 } musicstack_t;
 
-char music_stack_nextmusname[7];
-boolean music_stack_noposition;
-UINT32 music_stack_fadeout;
-UINT32 music_stack_fadein;
+extern char music_stack_nextmusname[7];
+extern boolean music_stack_noposition;
+extern UINT32 music_stack_fadeout;
+extern UINT32 music_stack_fadein;
 
 void S_SetStackAdjustmentStart(void);
 void S_AdjustMusicStackTics(void);
@@ -333,7 +333,7 @@ void S_StopSoundByNum(sfxenum_t sfxnum);
 #ifdef MUSICSLOT_COMPATIBILITY
 // For compatibility with code/scripts relying on older versions
 // This is a list of all the "special" slot names and their associated numbers
-const char *compat_special_music_slots[16];
+extern const char *compat_special_music_slots[16];
 #endif
 
 #endif
diff --git a/src/sdl/i_video.c b/src/sdl/i_video.c
index f35769e3c..e8fe020f0 100644
--- a/src/sdl/i_video.c
+++ b/src/sdl/i_video.c
@@ -217,7 +217,6 @@ static void SDLSetMode(INT32 width, INT32 height, SDL_bool fullscreen, SDL_bool
 	else
 	{
 		Impl_CreateWindow(fullscreen);
-		Impl_SetWindowIcon();
 		wasfullscreen = fullscreen;
 		SDL_SetWindowSize(window, width, height);
 		if (fullscreen)
@@ -1635,12 +1634,15 @@ static SDL_bool Impl_CreateWindow(SDL_bool fullscreen)
 	window = SDL_CreateWindow("SRB2 "VERSIONSTRING, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
 			realwidth, realheight, flags);
 
+
 	if (window == NULL)
 	{
 		CONS_Printf(M_GetText("Couldn't create window: %s\n"), SDL_GetError());
 		return SDL_FALSE;
 	}
 
+	Impl_SetWindowIcon();
+
 	return Impl_CreateContext();
 }
 
@@ -1657,12 +1659,8 @@ static void Impl_SetWindowName(const char *title)
 
 static void Impl_SetWindowIcon(void)
 {
-	if (window == NULL || icoSurface == NULL)
-	{
-		return;
-	}
-	//SDL2STUB(); // Monster Iestyn: why is this stubbed?
-	SDL_SetWindowIcon(window, icoSurface);
+	if (window && icoSurface)
+		SDL_SetWindowIcon(window, icoSurface);	
 }
 
 static void Impl_VideoSetupSDLBuffer(void)
@@ -1769,6 +1767,11 @@ void I_StartupGraphics(void)
 		VID_StartupOpenGL();
 #endif
 
+	// Window icon
+#ifdef HAVE_IMAGE
+	icoSurface = IMG_ReadXPMFromArray(SDL_icon_xpm);
+#endif	
+
 	// Fury: we do window initialization after GL setup to allow
 	// SDL_GL_LoadLibrary to work well on Windows
 
@@ -1787,11 +1790,6 @@ void I_StartupGraphics(void)
 #ifdef HAVE_TTF
 	I_ShutdownTTF();
 #endif
-	// Window icon
-#ifdef HAVE_IMAGE
-	icoSurface = IMG_ReadXPMFromArray(SDL_icon_xpm);
-#endif
-	Impl_SetWindowIcon();
 
 	VID_SetMode(VID_GetModeForSize(BASEVIDWIDTH, BASEVIDHEIGHT));
 
diff --git a/src/st_stuff.c b/src/st_stuff.c
index 12dcae360..9e107c247 100644
--- a/src/st_stuff.c
+++ b/src/st_stuff.c
@@ -1325,7 +1325,7 @@ void ST_drawTitleCard(void)
 {
 	char *lvlttl = mapheaderinfo[gamemap-1]->lvlttl;
 	char *subttl = mapheaderinfo[gamemap-1]->subttl;
-	INT32 actnum = mapheaderinfo[gamemap-1]->actnum;
+	UINT8 actnum = mapheaderinfo[gamemap-1]->actnum;
 	INT32 lvlttlxpos, ttlnumxpos, zonexpos;
 	INT32 subttlxpos = BASEVIDWIDTH/2;
 	INT32 ttlscroll = FixedInt(lt_scroll);
@@ -1382,7 +1382,12 @@ void ST_drawTitleCard(void)
 	if (actnum)
 	{
 		if (!splitscreen)
-			V_DrawMappedPatch(ttlnumxpos + ttlscroll, 104 - ttlscroll, 0, actpat, colormap);
+		{
+			if (actnum > 9) // slightly offset the act diamond for two-digit act numbers
+				V_DrawMappedPatch(ttlnumxpos + (V_LevelActNumWidth(actnum)/4) + ttlscroll, 104 - ttlscroll, 0, actpat, colormap);
+			else
+				V_DrawMappedPatch(ttlnumxpos + ttlscroll, 104 - ttlscroll, 0, actpat, colormap);
+		}
 		V_DrawLevelActNum(ttlnumxpos + ttlscroll, 104, V_PERPLAYER, actnum);
 	}
 
diff --git a/src/v_video.c b/src/v_video.c
index 142e85c68..772459333 100644
--- a/src/v_video.c
+++ b/src/v_video.c
@@ -2958,13 +2958,19 @@ void V_DrawPaddedTallNum(INT32 x, INT32 y, INT32 flags, INT32 num, INT32 digits)
 }
 
 // Draw an act number for a level title
-// Todo: actually draw two-digit numbers as two act num patches
-void V_DrawLevelActNum(INT32 x, INT32 y, INT32 flags, INT32 num)
+void V_DrawLevelActNum(INT32 x, INT32 y, INT32 flags, UINT8 num)
 {
-	if (num < 0 || num > 19)
+	if (num > 99)
 		return; // not supported
 
-	V_DrawScaledPatch(x, y, flags, ttlnum[num]);
+	while (num > 0)
+	{
+		if (num > 9) // if there are two digits, draw second digit first
+			V_DrawScaledPatch(x + (V_LevelActNumWidth(num) - V_LevelActNumWidth(num%10)), y, flags, ttlnum[num%10]);
+		else
+			V_DrawScaledPatch(x, y, flags, ttlnum[num]);
+		num = num/10;
+	}
 }
 
 // Write a string using the credit font
@@ -3345,13 +3351,21 @@ INT32 V_LevelNameHeight(const char *string)
 }
 
 // For ST_drawTitleCard
-// Returns the width of the act num patch
-INT32 V_LevelActNumWidth(INT32 num)
+// Returns the width of the act num patch(es)
+INT16 V_LevelActNumWidth(UINT8 num)
 {
-	if (num < 0 || num > 19)
-		return 0; // not a valid number
+	INT16 result = 0;
 
-	return SHORT(ttlnum[num]->width);
+	if (num == 0)
+		result = SHORT(ttlnum[num]->width);
+
+	while (num > 0 && num <= 99)
+	{
+		result = result + SHORT(ttlnum[num%10]->width);
+		num = num/10;
+	}
+
+	return result;
 }
 
 //
diff --git a/src/v_video.h b/src/v_video.h
index ed623a57f..664fa8995 100644
--- a/src/v_video.h
+++ b/src/v_video.h
@@ -238,12 +238,12 @@ void V_DrawRightAlignedSmallThinStringAtFixed(fixed_t x, fixed_t y, INT32 option
 // Draw tall nums, used for menu, HUD, intermission
 void V_DrawTallNum(INT32 x, INT32 y, INT32 flags, INT32 num);
 void V_DrawPaddedTallNum(INT32 x, INT32 y, INT32 flags, INT32 num, INT32 digits);
-void V_DrawLevelActNum(INT32 x, INT32 y, INT32 flags, INT32 num);
+void V_DrawLevelActNum(INT32 x, INT32 y, INT32 flags, UINT8 num);
 
 // Find string width from lt_font chars
 INT32 V_LevelNameWidth(const char *string);
 INT32 V_LevelNameHeight(const char *string);
-INT32 V_LevelActNumWidth(INT32 num); // act number width
+INT16 V_LevelActNumWidth(UINT8 num); // act number width
 
 void V_DrawCreditString(fixed_t x, fixed_t y, INT32 option, const char *string);
 INT32 V_CreditStringWidth(const char *string);
diff --git a/src/y_inter.c b/src/y_inter.c
index bfd8e7aa5..55b0c6823 100644
--- a/src/y_inter.c
+++ b/src/y_inter.c
@@ -73,7 +73,7 @@ typedef union
 		UINT32 score, total; // fake score, total
 		UINT32 tics; // time
 
-		INT32 actnum; // act number being displayed
+		UINT8 actnum; // act number being displayed
 		patch_t *ptotal; // TOTAL
 		UINT8 gotlife; // Number of extra lives obtained
 	} coop;