Can't change key
The score starts out in the key of G major (one sharp - F#), then changes to A major (three sharps -C#,F# and G#). I can make that change OK in measure 35. Then, in measure 41, the key changes back to G major (F# only). But when I drag the key signature to the measure, I get the # sign on the F line, which is correct, but I also get two natural signs, one on the C space and one on the G space. And, the music is totally played wrong, with the key all wrong and it sounds terrible. I've attached the file. The first blank measure is where the key change back to G major should be placed so those last 7 measures will be in G major.