I am already running 423. It crashed again twice today, again in the middle of songs I was editing yesterday.

Perhaps this has to do with the edits. Maybe when tracks in the song are disabled or the audio killed it somehow makes the program unstable. OTOH I'm also getting messages like "application not found" when I try to run some of the styles I have so maybe the program is corrupted. I shouldn't have styles in my library that the program can't manage.
_________________________
Equipment: Yamaha 5'6" grand piano. BIAB for Macintosh 2017 --> 2020. MacBook Pro. Focusrite 2i2, Yamaha YC 88 keyboard

"Why do I have to go to school, Grandad? If I watch YouTube I'll know everything!"
- Grandson #3