It appears the customizer code to automatically put a default background in is not working correctly. However, if you go to the theme options then the Header tab, you can select the background you want, click Publish and it works then. It’s the initial default setting that is not working….something I will have to look into on the WordPress side.
With our premium themes, we offer access to site documentation, video tutorials and timely support. Even if you have just started on WordPress, our support staff have the patience to help you create appealing sites gracefully.