8
Try checking your admin/system/preferences/general settings Scroll to bottom and make sure it isn't cached there and if your site is open then you should have the update templates/html check for "NO" up near the top.
If that doesn't work check your groups and make sure you have Access to the module set for anonymous/guest group and if you don't want them to see the block then scroll down and make sure it is unchecked in the right column groups blocks edit area.
Let us know.
Quest