We have a contact form on our site that uses the feedback module. To prevent spam attacks, we used a captcha. It worked well under 2.9, but when we recently upgraded to 3.1.1, the captcha always fails, meaning that even though the captcha is entered correctly, the feedback form is returned to the user without the data being submitted. Once the captcha field is deleted, the feedback is submitted properly, but if it is put back in, it always returns false.
Anyone else experience this and/or can offer some advice?