Hello,
Apologies for the Inconvenience!
We have just checked this out and it appears to be working fine for us: http://themes.semicolonweb.com/html/canvas/contact-recaptcha.html .
Additionally, no codes related to Captcha were modified, so this should not cause any issues. Only the PHPMailer and SPAM check were modified. Any chances, you could provide us with a Live URL or FTP Access in a Private Reply so that we can check this out for you? Thanks for your Patience.
Meanwhile, do let us know if we can help you with anything else or if you find any further issues with Canvas.