Some sites are (badly) designed to not bother checking whether an external reference resolved. There is nothing you can do about it from your end, other than complaining to the site's management. -- "Dance like the photo isn't being tagged; love like you've never been unfriended; and tweet like nobody is following."
reply to sm5w2 I can suggest Hostman, it will allow you to quickly enable/disable hosts for sites that are causing issues. »www.abelhadigital.com/hostsman
I assigned ctrl-alt-H to a hotkey to pop it up quickly.