Backwards-forwards movement when selecting bars

1. Open attached score.
2. From the left-bottom of the instruments, drag-select upwards to select all of the first bar, except the top three instruments. (You can include second and third instrument down if you want, but not the first.)
3. Hold shift and move 'right' using the keyboard.

Result: Selection moves forward mainly, but sometimes goes backwards.

Discussion: You can go leftwards and the behaviour will happen.

Using MuseScore 1.1 and 2.0 Nightly Build (5386) - Mac 10.6.8.