A handful of sites, mine included, suffers from a PHP error that comes from the Recaptcha‘s plugin for WordPress:
Warning: pack() [function.pack]: Type H: illegal hex digit L in /home/.grotton/wvcw/wvcw.org/wp-content/plugins/wp-recaptcha/recaptchalib.php on line 245.
I have disabled Recapcha for now until I get it fixed.
Update:
This error is caused by your private or public keys being incorrect. Check that there’s no spaces trailing or preceding the text that came from the recaptcha site, and make sure you have mailhide keys for the mailhide function, they are different from your normal site settings (or so it seems — give it a try). Good luck!