Everything was fine, switching now to Firefox instead of Safari since the editor has problems in Safari. But I wasn't able to save in Firefox, so I left (perhaps didn't formally sign out) and now I get an error message saying that "WordPress requires Cookies but your browser does not support them or they are blocked." But they're not. Checked both browsers and the error doesn't allow me to sign in.
What's the quickest fix for this? I saw similar errors related to updating, but I didn't update (to my knowledge, unless something happened during the no-saves).