I am an idiot. That is all.

src/NotesLoaderSM.cpp

@@ -560,7 +560,7 @@ bool SMLoader::LoadFromSMFile( const RString &sPath, Song &out, bool bFromCache
 
 		else if( sValueName=="OFFSET" )
 		{
-			out.m_fBeat0OffsetInSeconds = StringToFloat( sParams[1] );
+			out.m_SongTiming.m_fBeat0OffsetInSeconds = StringToFloat( sParams[1] );
 		}
 		else if( sValueName=="BPMS" )
 		{

src/Song.cpp

@@ -41,7 +41,7 @@
  * @brief The internal version of the cache for StepMania.
  *
  * Increment this value to invalidate the current cache. */
-const int FILE_CACHE_VERSION = 177;
+const int FILE_CACHE_VERSION = 178;
 
 /** @brief How long does a song sample last by default? */
 const float DEFAULT_MUSIC_SAMPLE_LENGTH = 12.f;

src/Song.h

@@ -287,9 +287,6 @@ public:
 	/** @brief The Song's TimingData. */
 	TimingData m_SongTiming;
 
-	/** @brief The initial offset of a song. */
-	float	m_fBeat0OffsetInSeconds;
-
 	typedef vector<BackgroundChange> 	VBackgroundChange;
 private:
 	/**