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.