inwd on "[Plugin: Contact Form 7] Still sending but not telling user"

I've been using this form for a long time. Only had an issue since updating to Wordpress 3.5.1 I don't use W3 Total Cache or Google Analytics.. I turned off all plugins and form still just spins and spins.. forms are being sent but sender has no idea.
Anyone else find a fix? Much appreciate a look...
http://www.herbycurby.com/index.php/contact-us/