Hi – I just posted this in another thread with the same problem — I figured it out — Give this a try.
WAIT! I think I found one of the problems. When we click to create a new contact form, the standard form is created for us to name and then modify. The developers forgot to fix something in their form. I finally found the errors. This may be it for all of you.
Go to the “Messages” tab when you are editing the contact form. Scroll to the very bottom. The last three are the standard Captcha responses to errors made by the person filling out the form. Even though this is a developer generated form, there is this error message in red to me under each of the three Captcha messages: HTML tags are not allowed in a message.
Delete the HTML tags in the message, save and You are GOLDEN. All error messages disappeared!! Woo Hoo!