[SOLVED] Suddenly no one can leave comments

Hi--
I'm having a problem with comments on my wordpress blog. For the first post, people were able to leave them fine. But on the second post, 6 readers sent me e-mails saying they couldn't leave a comment. When I am logged in, I can leave a comment, but when logged out this message comes up:
"invalid. no spam please!" On the tab associated with this page, it says: "wrong hcaptcha code."

The url is http://flamingseed.com/2010/11/no-su...nary/#more-664

I tried disabling Akismet to see if it was the cause, but the same message comes up. That is the only spam blocker on the site.

I am using WP 3.01 and Ahatualpa 3.4.9

I don't know html so don't know how to check the code.

Thanks for your help!

(This theme is wonderful and glad to find this forum. Glad to donate... no other way I could have created the site I wanted with my limited knowledge.)