I hope someone can help me please on fresh installs of concrete5 on 3 diferent servers on all contact forms i get the following error when captcha is turned on:
"The following fields are empty or incorrect:
Incorrect captcha code"

does anyone know how to solve this - the image shows fine and changes on every page refresh but it still does not work.
link to formhttp://www.pyrites.org/contact

or does anyone know how to add an invisible field to the form block?

Thnaks