Since the last update (21A5534d), my MacBook doesn't detect my 2nd display. I've tried swapping the display with a new one and trying different connection methods. My MacBook's built-in display goes black for a moment when I attach the cable, but nothing else happens. I seem to remember that the System Preferences > Displays used to have an option for manually detecting a display, but it doesn't appear to be there any more. I hope I'm not the only person experiencing this.