Unable to delete stock theme images in Fixer Theme Slider

When editing the top container we have two blank images which cannot be deleted. In fact we cannot delete any on the images added to the Image Slider. When editing and in the panel which allows you to order the images there is an X in the upper right corner. Pressing this does not remove the image. We tried deleting the image from the media folder and that doesn't help either. It is just a white box. http://iblog.dearbornschools.org/dragdropsample/