xbox 360 rockband controller wrong inputs

[sussyasian]

It works in the beginning BUT after every song change it makes the orange fret activate the blue fret and then the blue fret is not working at all until i restart the program

[TheNathannator]

This sounds like an issue on Festival's side, FestivalInstrumentMapper isn't even aware of the game while it's running and there's no way its mappings would suddenly change after something happens in-game like this.