I started working on banners today and have encountered multiple issues:
banner_block cannot be removed from layout - Settings in Layout section not being properly saved (if I refresh the page the banner_block shows up again sporadically).
Unable to delete banner_block from Blocks section or set status to 'Off' - Caused by blocks being detected as still in use in Layout, related to issue above.
I am working on default_html5, and have disabled AdBlock Plus and NoScript so that all scripts on localhost can run.