Change to Master Tuning doesn't sound until re-opening MuseScore

1. Open score.
2. 'Synthesiser'.
3. Ensure soundfont is loaded.
4. 'Play'.
5. Change 'Master Tuning' to 460.0Hz.

Result: Pitch doesn't sound different.

6. 'Quit'.
7. Open MuseScore.
8. Open score.
9. 'Synthesiser'.
10. 'Play'.

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.