[Trunk] Part doesn't appear

1. Create score.
2. Enable 'Note Entry'.
3. Enter some notes.
4. Disable 'Note Entry'.
5. Open 'Parts'.
6. Create a part for the instrument.
7. 'Create Part'.
8. 'Close'.
9. Save score.
10. Close score.
11. Re-open score.
12. Open the part.

Result: No part appears.

Using MuseScore 2.0 Nightly Build (4832) - Mac 10.6.8.