diff --git a/SpaceCadetPinball/control.cpp b/SpaceCadetPinball/control.cpp
index 5e401bb..56d8a3b 100644
--- a/SpaceCadetPinball/control.cpp
+++ b/SpaceCadetPinball/control.cpp
@@ -1019,7 +1019,7 @@ void control::LaunchRampControl(int code, TPinballComponent* caller)
 			{
 				sound = control_soundwave21_tag.Component;
 			}
-			else if (someFlag <= 1 || someFlag > 3)
+			else if (someFlag < 1 || someFlag > 3)
 			{
 				sound = control_soundwave24_tag.Component;
 			}
@@ -2148,7 +2148,7 @@ void control::HyperspaceKickOutControl(int code, TPinballComponent* caller)
 		}
 		else
 		{
-			if (someFlag <= 1 || someFlag > 3)
+			if (someFlag < 1 || someFlag > 3)
 			{
 				auto duration = control_soundwave41_tag.Component->Play();
 				control_soundwave36_1_tag.Component->Play();
@@ -2919,7 +2919,7 @@ void control::GameoverController(int code, TPinballComponent* caller)
 
 	if (missionMsg & 0x200)
 	{
-		int highscoreId = missionMsg % 4;
+		int highscoreId = missionMsg % 5;
 		int highScore = pb::highscore_table[highscoreId].Score;
 		auto nextHidhscoreId = highscoreId + 1;
 		if (highScore > 0)
diff --git a/SpaceCadetPinball/fullscrn.cpp b/SpaceCadetPinball/fullscrn.cpp
index fa838c3..7b4be33 100644
--- a/SpaceCadetPinball/fullscrn.cpp
+++ b/SpaceCadetPinball/fullscrn.cpp
@@ -57,10 +57,11 @@ int fullscrn::enableFullscreen()
 {
 	if (!display_changed)
 	{
-		SDL_SetWindowFullscreen(winmain::MainWindow, SDL_WINDOW_FULLSCREEN_DESKTOP);
-		display_changed = 1;
-		if (display_changed)
+		if (SDL_SetWindowFullscreen(winmain::MainWindow, SDL_WINDOW_FULLSCREEN_DESKTOP) == 0)
+		{
+			display_changed = 1;
 			return 1;
+		}
 	}
 	return 0;
 }
@@ -69,8 +70,8 @@ int fullscrn::disableFullscreen()
 {
 	if (display_changed)
 	{
-		SDL_SetWindowFullscreen(winmain::MainWindow, 0);
-		display_changed = 0;
+		if (SDL_SetWindowFullscreen(winmain::MainWindow, 0) == 0)
+			display_changed = 0;
 	}
 
 	return 0;
diff --git a/SpaceCadetPinball/midi.cpp b/SpaceCadetPinball/midi.cpp
index 68a19a1..a049a67 100644
--- a/SpaceCadetPinball/midi.cpp
+++ b/SpaceCadetPinball/midi.cpp
@@ -316,7 +316,11 @@ std::vector<uint8_t>* midi::MdsToMidi(std::string file)
 	while (false);
 
 	delete[] fileBuf;
-	if (returnCode && midiOut)
+	if (returnCode && midiOut) 
+	{
 		delete midiOut;
+		midiOut = nullptr;
+	}
+
 	return midiOut;
 }