I get a consistent crash with the latest beta, when clicking on playlists in the tree. Versions before the harmonic mixing update beta work fine, but for me, it’s 3.1.2 onwards (which was reversioned to 3.2 for public beta). Weirdly, some of the my playlists work fine.
You may have to send me a copy of your NML file so that I can try and repro here.
Sent it to you via email.
This will be fixed in the next beta.