save Preferred, Stage, Song, and Current modifiers separately. This eliminates the fragile mods store/restore.

stepmania/src/ScreenHowToPlay.cpp

@@ -170,7 +170,7 @@ void ScreenHowToPlay::Init()
 		SET_XY_AND_ON_COMMAND( m_Player );
 
 		// Don't show judgement
-		GAMESTATE->m_pPlayerState[PLAYER_1]->m_PlayerOptions.m_fBlind = 1;
+		MODS_GROUP_ASSIGN( GAMESTATE->m_pPlayerState[PLAYER_1]->m_PlayerOptions, ModsLevel_Stage, .m_fBlind = 1 );
 		GAMESTATE->m_MasterPlayerNumber = PLAYER_1;
 		GAMESTATE->m_bDemonstrationOrJukebox = true;
 	}