SongBook App Defects

The new version 2 app has some strange behaviours that were not there in the earlier version:

1 in the Mixer the Solo buttons act erratically. So the solo voice plays or does not play contrary to what it says .
2. In the mixer there are only three tracks to control when the score has four tracks.
3. When the mixer is set up to play in a certain way (eg soloing instruments other than your own so you can practice), the app forgets the setting the next time it is opened. It did not do this before.

On the SongBook page with the songs listed ready for selection the number of parts is displayed but not the number of bars as was displayed in the older version.