Change to Master Tuning doesn't sound until re-opening MuseScore
1. Open score.
3. Ensure soundfont is loaded.
5. Change 'Master Tuning' to 460.0Hz.
Result: Pitch doesn't sound different.
7. Open MuseScore.
8. Open score.
Result: Pitch sounds at 460.0Hz, but displays in Synthesiser at 440.0Hz.
Discussion: If you repeat steps 6-10 after step 10, it will appear and sound at 440.0Hz.
Using MuseScore 2.0 Nightly Build (5576) - Mac 10.7.3.