A slideshow is setup in your Sphere CMS website. When viewing the page where the slideshow is, you see one of the images, then the page refreshes to show a blank image or non-existent image.
This typically occurs when only one image is selected for the content for the slideshow. If you want a static image to show, two images must be selected the content. It's OK for the 2nd image to be a copy of the first.