[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. Open part.

Result: No part appears.

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