SoundFont Directory doesn't appear in Synthesiser or Default SoundFont

1. 'Preferences'.
2. Click on 'SoundFonts Directory' box.
3. Select location.
4. 'Choose'.
5. 'OK'.
6. 'Open'.
7. Select score.
8. 'Open'.

9. 'Synthesiser'.
10. 'Add'.

OR:

9. 'Preferences'.
10. 'I/0'.
11. Click on box next to 'Default SoundFont'.

Result: Soundfont directory isn't in view.

Using MuseScore 2.0 Nightly Build (5528) - Mac 10.7.3.