Zotero error 1921633966. On restart a collection disappeared
Second time this happened. First time the collection name was Word
I somehow was able to recover the content and put it into a collection WordB
Now this collection disappeared
I somehow was able to recover the content and put it into a collection WordB
Now this collection disappeared
Invalid collection nesting should be prevented by this error, but if it somehow happened regardless, you should be able to fix it by checking your database integrity from the Advanced → Files and Folders pane of the Zotero preferences.