eddycom on "[Plugin: Contact Form 7] Send button load continuously but does not show "Message sent successfully""

Hi Takayuki,
I tried everything: uninstalled all plugins, changed to default theme, reinstalled WP 3.5.1, uninstalled and reinstalled "Contact Form 7", changed the contact page. Uninstalled clockworksms plugins SMS. But the icon Ajax-loader after submit continues to run without showing the word "The message was sent success...", although the sending text and the sms was sent and received normaly. Please, help me
Thanks