Do you have SSL installed on your site ?
IF you enabled the captcha for tell a friend and other pages. and not working , try this ..
open captcha.php located in include / classes ..
on line 68 ish .. change SSL to NONSSL .. save and update with the one on your server , and see if it works.
if it didn't then change it back to SSL again to make sure everything is back to what it was.
PS. do you have a link to the contact us section of your site ?? might be able to figure out something from there.
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