keep track of when the music position hasn't been updated at

all (which isn't the same as being at beat 0)

stepmania/src/GameState.cpp

@@ -96,9 +96,11 @@ void GameState::ResetLastRanking()
 	}
 }
 
+const float GameState::MUSIC_SECONDS_INVALID = -5000.0f;
+
 void GameState::ResetMusicStatistics()
 {	
-	m_fMusicSeconds = 0;
+	m_fMusicSeconds = MUSIC_SECONDS_INVALID;
 	m_fSongBeat = 0;
 	m_fCurBPS = 10;
 	m_bFreeze = false;

stepmania/src/GameState.h

@@ -94,6 +94,7 @@ public:
 	float		m_fCurBPS;
 	bool		m_bFreeze;	// in the middle of a freeze
 	bool		m_bPastHereWeGo;
+	static const float MUSIC_SECONDS_INVALID;
 
 	void ResetMusicStatistics();		// Call this when it's time to play a new song.  Clears the values above.
 	void UpdateSongPosition(float fPositionSeconds);