I have posted this in the Mac forum but no replies as yet and it is getting urgent. I upgraded from BIAB 2020 because I was unable to record audio due to a WAV error message since upgrading my operating system. This issue is now resolved, but...

Now these two things appear to happen randomly:-

1.The melody line of the song is not visible when I open a song file and click on the notation button to change the screen from chord sheet to song with melody and chords(or occasionally it is) The melody exists, because I have been using it for years, and I can hear it,

2.My voice doesn't record on to the audio file - ie sometimes it does, sometimes it doesn't depending on which song I'm recording.
(I am changing nothing else in between)

I'm not a beginner but I'm not a techie either, and for years have only asked of BIAB that it records my voice over the accompaniment - I never need to use any of the bells and whistles.
Thanks in advance for any help!

Mac OS Monterey 12.6.4 BIAB 2022 (611)