WP Captcha-Free is a lightweight plugin that blocks automated comment spam without using captcha (image verfication).
Upgraded to 3.6 and then it started blocking anyone who was not registered from commenting. My first thought that the failure was due to another plugin that I recently installed, but deactivating that had no effect. I was still getting ENTER YOUR NAME AND EMAIL and ENTER A COMMENT ERRORS no matter what I did or what settings were in place. When I deactivated this plugin, my troubles magically disappeared and all went back to normal. Didn't need it anyway as I have an anti-spam plugin that works very well in blocking spammers.
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