My whole library disappeared
My entire library disappeared from online and from the computers I use Zotero from. I have no idea what happened.
This is an old discussion that has not been active in a long time. Before commenting here, you should strongly consider starting a new discussion instead. If you think the content of this discussion is still relevant, you can link to it from your new discussion.
It looks like you've since recreated things? Maybe by reimporting from a file and using Restore to Online Library? That clears some of the syncing history, so I'm not able to see when any deletions were made.
If you're not sure what happened, I'd recommend going to your key settings and deleting all "Automatic Zotero Client Key" entries except for the most recent one. You may then have to set up syncing again with your username and password on any other computers, but you'll be sure that no one else has access to your library.