Upon upgrading from 2022 to 2024 I find multiple songs that had tracks frozen under the 2022 version that now have silence or missing sections, especially but not exclusively in the drums. They also will not regenerate when un-frozen. I've been working with support on this via email, but since they are not raising the alarm here I feel that I should. You might want to hold off on any upgrades until they fix this issue if you require access to your existing songs. This upgrade appears destructive. I haven't experienced this issue creating new songs completely under 2024, build 1104.