[boost] [Trac] Captcha not working - blocking contributions

I tried to include some code in a ticket (#9531, to be precise) and Trac tried to make me complete a captcha to prove I'm not spam. However, the captcha doesn't appear: https://drive.google.com/file/d/0B-RwWpWIiF0VRXVjTE5nM0VHekE/edit?usp=sharin... Any ideas? Alex -- Swish - Easy SFTP for Windows Explorer (http://www.swish-sftp.org)