playback misses notes

On entering a double stop on a Contrabass staff one of the notes sounds in the correct octave (one octave below written) and the other does not.

1) Enter a whole note D on a Contrabass staff;

2) Enter a whole note G on the same measure a fourth higher. This second note does not sound when entered and sounds an octave higher than it should during playback. This also happens when entering the same two notes each in different voices.

This did not happen with 9.0.4 on ubuntu hardy. I does happen with 9.0.5.