I just want to warn everyone about something I just experienced (and was able to recreate immediately).
When using the 'Copy Track Effects' feature in the Audio Track Mixer and pasting the effect onto another sequence, any save made after that will become corrupt and unusable.
For context, I had multiple sequences open because I was making the same change to all of them (adding a DeEsser). I copied the DeEsser from one sequence and pasted it onto the rest of my sequences. After doing that, I noticed my timeline disappeared, along with all my audio tracks in the mixer. I saved and quit, thinking it would fix the broken windows, but when I tried to open my project again, it crashed on launch.
Two of my autosaves were also corrupted, and I had to go back to an even older autosave and redo my work. Out of curiosity, I tested it again to see if I could recreate the glitch - and sure enough, it happened immediately after just one copy-paste.
I haven't tested whether it's specifically the DeEsser effect causing the issue or if it's a general bug with copying and pasting effects, but I don't have time to investigate further. I just wanted to quickly post this here in case it helps someone avoid the same problem - or, maybe, so that Adobe, the monolithic, greedy company that it is, might actually do something and fix a basic feature of their so-called 'professional' software.