Bilgewater Music Not Playing (Even when selected)

When I select playing the Bilgewater event music instead of the Updated theme, there is no sound. (Currently when the music option is changed from Updated to Bilgewater, there is no sound for the Bilgewater theme. )

This is probably cause I got a new Mac and redownloaded League after the event, but how do I fix it to get the sound file in the game?