Disappearing Chords

MuseScore 0.9.5 R2012 WinXP Media Center V5.1 SP3

I don't believe this bug has been reported before. If so, my apologies.

Changing the note value of a chord in a tuple causes the chord to disappear.

In the example, select the top note of a chord. Press "5" to double the value of the chord. All notes but the one selected disappear. If the chord is not part of a tuple, all the notes of the chord are doubled in value, as is the case with the chord on the third beat.