diff --git a/src/boards/addrlatch.cpp b/src/boards/addrlatch.cpp
index 05d05f0b..67ae7d55 100644
--- a/src/boards/addrlatch.cpp
+++ b/src/boards/addrlatch.cpp
@@ -122,7 +122,7 @@ static void UNL43272Sync(void) {
 	if ((latche & 0x81) == 0x81) {
 		setprg32(0x8000, (latche & 0x38) >> 3);
 	} else
-		FCEU_printf("unrecognized command %04!\n", latche);
+		FCEU_printf("unrecognized command %04x!\n", latche);
 	setchr8(0);
 	setmirror(0);
 }
diff --git a/src/drivers/Qt/unix-netplay.cpp b/src/drivers/Qt/unix-netplay.cpp
index 687ff18c..1683fe7f 100644
--- a/src/drivers/Qt/unix-netplay.cpp
+++ b/src/drivers/Qt/unix-netplay.cpp
@@ -120,7 +120,7 @@ FCEUD_NetworkConnect(void)
 	if(TSocket < 0) {
 		const char* s = "Error creating stream socket.";
 		puts(s);
-		FCEU_DispMessage(s,0);
+		FCEU_DispMessage("%s",0,s);
 		FCEUD_NetworkClose();
 		return 0;
 	}
diff --git a/src/ines.cpp b/src/ines.cpp
index de4fd481..c2824a37 100644
--- a/src/ines.cpp
+++ b/src/ines.cpp
@@ -899,7 +899,7 @@ int iNESLoad(const char *name, FCEUFILE *fp, int OverwriteVidMode) {
 			GameInfo->type = GIT_VSUNI;
 			break;
 		default:
-			FCEU_PrintError("Game type is not supported at all.", MapperNo);
+			FCEU_PrintError("Game type is not supported at all.");
 			goto init_error;
 		}
 	}
@@ -969,7 +969,7 @@ int iNESLoad(const char *name, FCEUFILE *fp, int OverwriteVidMode) {
 
 	FCEU_printf(" PRG ROM: %d x 16KiB = %d KiB\n", round ? ROM_size : not_round_size, (round ? ROM_size : not_round_size) * 16);
 	FCEU_printf(" CHR ROM: %d x  8KiB = %d KiB\n", VROM_size, VROM_size * 8);
-	FCEU_printf(" ROM CRC32: 0x%08lx\n", iNESGameCRC32);
+	FCEU_printf(" ROM CRC32: 0x%08x\n", iNESGameCRC32);
 	{
 		int x;
 		FCEU_printf(" ROM MD5:  0x");
diff --git a/src/movie.cpp b/src/movie.cpp
index 9df0ffc1..e4721bd6 100644
--- a/src/movie.cpp
+++ b/src/movie.cpp
@@ -1583,10 +1583,10 @@ bool FCEUMOV_ReadState(EMUFILE* is, uint32 size)
 					//TODO: turn frame counter to red to get attention
 					if (!backupSavestates)	//If backups are disabled we can just resume normally since we can't restore so stop movie and inform user
 					{
-						FCEU_PrintError("Error: Savestate taken from a frame (%d) after the final frame in the savestated movie (%d) cannot be verified against current movie (%d). This is not permitted.\nUnable to restore backup, movie playback stopped.", currFrameCounter, tempMovieData.records.size() - 1, currMovieData.records.size() - 1);
+						FCEU_PrintError("Error: Savestate taken from a frame (%d) after the final frame in the savestated movie (%zi) cannot be verified against current movie (%zi). This is not permitted.\nUnable to restore backup, movie playback stopped.", currFrameCounter, tempMovieData.records.size() - 1, currMovieData.records.size() - 1);
 						FCEUI_StopMovie();
 					} else
-						FCEU_PrintError("Savestate taken from a frame (%d) after the final frame in the savestated movie (%d) cannot be verified against current movie (%d). This is not permitted.", currFrameCounter, tempMovieData.records.size() - 1, currMovieData.records.size() - 1);
+						FCEU_PrintError("Savestate taken from a frame (%d) after the final frame in the savestated movie (%zi) cannot be verified against current movie (%zi). This is not permitted.", currFrameCounter, tempMovieData.records.size() - 1, currMovieData.records.size() - 1);
 					return false;
 				}
 			}
@@ -1742,7 +1742,7 @@ void FCEUI_MovieToggleReadOnly()
 		strcpy(message, "Movie is now Read+Write");
 	
 	strcat(message, GetMovieModeStr());
-	FCEU_DispMessage(message,0);
+	FCEU_DispMessage("%s",0,message);
 }
 
 void FCEUI_MovieToggleRecording()
@@ -1786,7 +1786,7 @@ void FCEUI_MovieToggleRecording()
 
 	strcat(message, GetMovieModeStr());
 
-	FCEU_DispMessage(message, 0);
+	FCEU_DispMessage("%s",0,message);
 }
 
 void FCEUI_MovieInsertFrame()
@@ -1813,7 +1813,7 @@ void FCEUI_MovieInsertFrame()
 		strcat(message, GetMovieModeStr());
 	}
 
-	FCEU_DispMessage(message, 0);
+	FCEU_DispMessage("%s",0,message);
 }
 
 void FCEUI_MovieDeleteFrame()
@@ -1851,7 +1851,7 @@ void FCEUI_MovieDeleteFrame()
 		strcat(message, GetMovieModeStr());
 	}
 
-	FCEU_DispMessage(message, 0);
+	FCEU_DispMessage("%s",0,message);
 }
 
 void FCEUI_MovieTruncate()
@@ -1889,7 +1889,7 @@ void FCEUI_MovieTruncate()
 		strcat(message, GetMovieModeStr());
 	}
 
-	FCEU_DispMessage(message, 0);
+	FCEU_DispMessage("%s",0,message);
 }
 
 void FCEUI_MovieNextRecordMode()
diff --git a/src/unif.cpp b/src/unif.cpp
index 9cc59e20..be20535a 100644
--- a/src/unif.cpp
+++ b/src/unif.cpp
@@ -140,7 +140,7 @@ static int DoMirroring(FCEUFILE *fp) {
 				return(0);
 			FCEU_printf(" %02x", t);
 		}
-		FCEU_printf("\n Default Name/Attribute Table Mirroring: Horizontal\n", uchead.info);
+		FCEU_printf("\n Default Name/Attribute Table Mirroring: Horizontal\n");
 		mirrortodo = 0;
 	}
 	return(1);
diff --git a/src/utils/memory.cpp b/src/utils/memory.cpp
index fa5d65b4..a702311a 100644
--- a/src/utils/memory.cpp
+++ b/src/utils/memory.cpp
@@ -112,6 +112,6 @@ void* FCEU_realloc(void* ptr, size_t size)
 
 void FCEU_abort(const char* message)
 {
-	if(message) FCEU_PrintError(message);
+	if(message) FCEU_PrintError("%s", message);
 	abort();
 }
diff --git a/src/video.cpp b/src/video.cpp
index c5c55134..7d7744d4 100644
--- a/src/video.cpp
+++ b/src/video.cpp
@@ -422,7 +422,7 @@ void FCEU_DispMessage( __FCEU_PRINTF_FORMAT const char *format, int disppos=0, .
 	vsnprintf(temp,sizeof(temp),format,ap);
 	va_end(ap);
 	strcat(temp, "\n");
-	FCEU_printf(temp);
+	FCEU_printf("%s",temp);
 
 	if ( vidGuiMsgEna )
 	{