REFRESH: Try a F5 to Refresh your browser. Publishing will be prohibited if you've exceed your page limit or your storage limit. Your account allows for 25mb of disk space. You are attempting to exceed that amount, so it will not publish. You may add 1gb of space for $2/month, or you can look in the file manager and see if there are files no longer on a page that you can delete to free up some space.
You are attempting to publish a 6th page on a 5 page account. You can upgrade to 15 pages for $2/month or remove a page. Do not remove the siteerror404 page. It is a system page and does not count towards your page quota.