I've uploaded new banner to my site: open the site in Sitebuilder Wizard, change to page "Banners" and click on "Browse...", locate an image and click "Upload"
However new banner is not shown in the list of banners on page "Design" and in site preview. Why?
Old banner has been cashed in your web browser and new banner is not shown even it has been uploaded correctly.
Clear cache in your browser and reload the page.