Running WordPress 3.4.1. I had been running 3.4.6, due to a PHP configuration problem on the old server that caused Atahualpa not to work. A few months we migrated to a new server and a few nights ago I finally got around to manually upgrading the theme to version 3.7.7. Everything works fine except the plugin Si Captcha (version 2.7.5) isn't working. If I roll back to Atahualpa 3.4.1, the captcha's show up as they're supposed to with the comments, but with 3.7.7 installed they disappear. Any ideas?

just installed it with 3.7.7 and it is working fine for me. disable all other plugins and see if there is a conflict

I think I got the problem fixed. I disabled the comments function in the Jetpack plugin and everything seems to be working again. Not surprising, as Jetpack seems to be a poorly designed resource hog. Thanks for your help, and thanks for the great theme. I'm glad to see that the number of PHP queries has been greatly reduced in the newer versions!