Background selector (bgrs) does not work?

BlueOwlCreative, I’m apologize to be here again,I imagine you have alot of work to do… ^:)^
I’m not sure, but I remember that when I started my project there was an option to choose the background via a background selector (Customize).
Now the selector does not work fine. I can upload an image, sure, but there is not a list of images (bgrs) where I can choose the background. Please see this image: http://www.guidedolomiti.com/screenshot.jpg
Always sorry for my English, I hope you understand my question.
Thanks for your patience.