I got it working with these steps: 1. Sign out of Evernote from the "Evernote" menu. 2. Quit Evernote. 3. Quit the helper from the menu bar menu. 4. Verified no Evernote processes were running in Activity Monitor. 5. Deleted the Evernote application, but none of the support files. 6. Reinstalled from the App Store. 7. Launched Evernote. 8. Signed back in. 9. The new Quick Note worked when I clicked the menu bar icon. Reading what other people have done makes me think deleting and reinstalling weren't even necessary, but at the time I figured I might as well.