[trunk] 'Rehearsal Mark' Text Missing

Setup: MuseScore trunk rev. 4146 (nightly backup) under Win XP

Steps:
1) load or create a score whatever;
2) add Rehearsal Mark text;
3) save the file;
4) close the file and reopen it;

Result: Rehearsal Mark text is missing in the file.

Notes: I checked the saved file (mscx, uncompressed format) and the Rehearsal Mark text is there. When the save file is reloaded, Rehearsal Mark text is missing in the score display.