I'm using the Vitality_Homepage template and installed 6 slides in the template slideshow using the "Header Background" feature on the "General Styling" tab. When I click "List/Add Header Background Image(s) and try to change one of my images, it will not allow me to do that. When I click the "Select" or "X" button, nothing happens. The slideshow looks good and works fine except for this issue. How can I change my slides?