I use Evernote Version 6.13 (455673 Direct) on a Mac (with Sierra). A few days ago, I updated my Evernote version as proposed by the software. Since then, I can't reach thousands of notes.
What I still have: very old notes (from 2009 to 2012) and new notes created since updating Evernote.
What I dont have anymore: notes after 2012 til the day of update. About 5000-6000 notes...
What still works: On my other device (a Windows one) and on the web, I still have my complete set of notes. Furthermore, syncing works correctly for new notes, both way.
What I tried: reinst