Same problem. ALL note content is blank. I have been using the new version for a while, so I don't think it is a syncing issue.
I work with Evernote primarily on the desktop app and the same problem exists with old and newly created notes.
Restart (of app or computer) does not fix the problem.
If I uninstall and re-install, the problem is resolved, but occurs again in just a few days.
Note content is still present in the web version.
I submitted a support ticket with Evernote logs and screenshot.