Hi EliRoegge,
It seems like the music isn't loading correctly and that is why playback isn't working. Can you send me the mp3 file that you are trying to load along with the drill at contact@box5software.com, or wlee@box5software.com so I can investigate further?
Have you been able to load this music on this computer before? Have you been opening this file on multiple computers?
Have a great day!