Your work-around worked! Thank-you!
I started experiencing this behaviour today, too. Like JBB above, I have uninstalled/reinstalled the Evernote clipper extension several times, restarted Safari, signed in/out, tried gallery/developer versions and restarted my Mac. The only other extension installed in Safari is 1Password. Versions: - Evernote clipper: 6.12.4 - 1Password: 4.6.11 - Safari: 11.0 (13604.1.38.1.6)