But finally Blogger is at least giving us a hint what's going on, and offering suggestions on how to deal with the situation. There are two possibilities here, each with its own cause and remedy. Learn the difference.
- Content Analysis. Your blog may look like spam, or maybe other Bloggers flagged you mistakenly. If there's a "?" beside the Captcha, you can fill out the form accessed from clicking there, and your blog will be whitelisted. Note the form that you fill out will require a working, Blogger friendly email address.
- Posting Behaviour. If you make an excessive amount of posts in one day, you'll have to verify each time you post, for that day. This can't be whitelisted. You may, or may not, see a "?". If you do see a "?", it probably won't be clickable.
So the excessive posts trigger is bad news, since we aren't told what number is excessive (I'll bet that it's dynamic, based upon current trends), and it can't be whitelisted. But it does go away in 24 hours, if you moderate your posting activity.