Captcha text not being stored in the session

Hi,

I have an issue where the contact form keeps repeating the ‘please enter the correct captcha text’ message.

I’ve tracked this down to where the code compares the text entered with the captcha text stored in the session. When I expose whats in the session it is empty and therefore the two do not match.

Have you any idea why this is the case and how to resolve it?

Thanks
Ben