[Trunk] Changing time signature during playback and stopping causes crash

1. Open attached score.
2. 'Play'.
3. Drag 3/4 time signature onto score.
4. 'Yes' to "Rewrite measures until next time signature?".
5. 'Stop' soon after there are no notes being played.

Result: Crash.

Discussion: I could also crash it sometimes when notes were being played (in both 1.1 and the trunk) - maybe that was when the laptop was hotter.

Using MuseScore 2.0 Nightly Build (4959) - Mac 10.6.8.