When you set the PlayerList CoreGui to be visible, all controller input is frozen. Your last thumbstick position for both character and camera navigation are stuck and the game accepts no more input until you go into the Esc menu and screw around in there, after which point you need to jostle the thumbsticks again to unstick them. Occasionally the mouse cursor goes invisible too. Happens 100% of the time on both client and Studio. Running on Windows 10.
Now the same situation listed in the OP seems to select a random object in the leaderboard and lock controller input, as opposed to making it stick. It’s fixed by tapping the selection button on the controller.
