I have the following site www.sobreruedasonline.com.mx, but selecting an ad and fill out the contact form the following error in the capcha comes to me: Captcha invalid. Please try again!

Dear Customer,

Kindly send your site URL, Joomla admin username and password, FTP details to This email address is being protected from spambots. You need JavaScript enabled to view it. . So that we will check and update you.

Thanks.

I had this same problem because my site changed from http to https.

The fix is to edit /components/com_jomclassifieds/etc/recaptchalib.php

RECAPTCHA_API_SERVER change from www.google.com/recaptcha/api to www.google.com/recaptcha/api