Only play attacks if upcoming, not past.

src/ScreenEdit.cpp

@@ -4289,6 +4289,8 @@ void ScreenEdit::SetupCourseAttacks()
 		{
 			FOREACH(Attack, attacks, attack)
 			{
+				float fBeat = GetAppropriateTiming().GetBeatFromElapsedTime(attack->fStartSecond);
+				if (fBeat >= GetBeat())
 					GAMESTATE->m_pPlayerState[PLAYER_1]->LaunchAttack( *attack );
 			}
 		}