Wrong MP3 fiile playing.

I have MP3 files in an MP3 folder on my memory card to keep the tablet space for lyrics, setlists and apps. In this folder I have an MP3 of the original song that I use to practice with. For songs that I perform solo or in a duo, I have sub-folders with the backing tracks in. They are named exactly the same as the original so I don't have to edit the song to switch to live performance mode, I merely change the Backing folder to the appropriate sub folder (e.g. Backtrack Solo). In LP2 this works. In LP3 it seems to ignore the settings and plays the original. This is either a bug or a feature that I don't understand. Hope you can help!

I just restarted LP3 and now it is playing the correct MP3? Must I rescan after changing the path in settings?