A couple of questions have been posted to the Yahoo forum recently about the Word Verification feature on their blogs. Basically, there are a couple of processes that can cause your blog to get flagged. (One is when visitors tick the flag at the top of the blog, another is the Blogger “robot’ scanning your site and determining that your content is Spam. The ‘robot’ is not the most inteligent thing in the world).
Anyway, the blogger help page here, describes the method required to get word Verification turned off.
To avoid further inconveniences when publishing, click the “?” (question mark) icon next to the word verification on your posting form: