[Plugin: Contact Form 7] CF7 version 3.3.x broke my form

I have a simple CF7 form (email address only) used with the Contact Form 7 – Constant Contact Module. After upgrading CF7 to version 3.3 or 3.3.1 the form breaks giving me the dreaded red boxed “Failed to send your message. Please try later or contact administrator by other way” error message. Downgrading back to CF7 version 3.2.1 fixes the form.

Along with the Constant Contact Module, the form opens in a Colorbox window. After the form is submitted, it sets a cookie and closes the Colorbox window. Here is the “Additional Settings” code I am using:

on_sent_ok: “var expires = new Date();expires.setDate(expires.getDate()+30);document.cookie = “resourcesVisited=true; path=/; expires=”+expires.toUTCString();parent.$.fn.colorbox.close();”

I tried using “on_submit” instead of “on_sent_ok” but it didn’t work. Downgrading back to 3.2.1 is the only solution I have right now.

http://wordpress.org/extend/plugins/contact-form-7/