The scoreboard is fed by the signed-in channel (chat events + channel stats), so offering its
switches to a signed-out user is a dead control. The whole block now binds IsEnabled to IsConnected
and shows one line — "Sign in to YouTube to use the scoreboard." — instead of looking broken.
Nothing extra is needed to re-enable: IsConnected already raises on sign-in/out, so the block
comes alive the moment the session lands.
Guard: ScoreboardPropertiesTests asserts the IsEnabled binding, the signed-out hint and that the
hint is gated by the inverse converter.
gramps
ea1017776d