Fixed: a note typed on Dashboard or in Notes more than two hours after the page was opened was not saved, and the note window said the session had expired while you were still signed in. The page now gets a new form token and saves the note.
In Dashboard's note window, ⌘S (Ctrl+S on Windows) saves the note at once, as in Notes. If you have been signed out, the window says so and keeps your text; sign in again in a new tab, and the note will be saved when you return to it.