The Captcha Image on the templated captcha control does not display when the user is not logged in.
There is an issue in code with authentication for the page.
This issue is resolved in 9.1 versions and up. If you are unable to upgrade, use the workaround listed below.
In the file ~\Workarea\captchaImage.aspx.cs, update the Page_Load method to set AllowAnonymous = true; as the first line. For example:
protected void Page_Load(object sender, EventArgs e)
{
AllowAnonymous = true; //original code goes here
}
This change disables authentication for this page. As a result, the captcha image will appear regardless of logged-in state.