Stroke on multiple acciaccatura doesn't appear after save

1. Create score.
2. Add note.
3. Drag two acciaccatura to note.
4. Save.
5. Close.
6. Re-open.

Result: The stroke for the acciaccaturas doesn't appear.

Using MuseScore 1.1 and 2.0 Nightly Build (4616) - Mac 10.6.8.