Make sure all other apps are closed before trying to record a new scene or playing back an existing scene.

If that doesn’t work try restarting your machine.

You also want to be the only person in your frame  and that your entire body is visible within the frame. and make sure that your background is as uncluttered as possible, as certain artifacts may register as another humanoid object by the AI.

If that still doesn’t work please get in touch.