I received a report from a Wordpress account holder, they were forced to solve the Captcha puzzles when leaving comments. Even though I had switched off word verification. I hope by changing the comment format, the puzzles won't be asked any more.
The change I am making, is going from the embedded form (my personal favourite) to the full page comment form, instead.
Can I ask a favour of my readers, to leave a comment here, telling me if you've been asked to solve a puzzle - or just tick the, "I'm not a robot" box? Thank you. :)
UPDATE: I put this question to the Blogger help forum, and was given some new information about my dilemma. It may be a known issue for Wordpress account holders, trying to authenticate using Open ID. It's always interesting to learn how blogs work.
So as a result, I'm reverting back to my original "embedded" comments box. I appreciate the feedback I received, and welcome any further questions or feedback anyone else wants to leave. It may be in relation to your own blog, because as blog authors, we cannot see what others do, in the comments section.