Searched for a solution and here it is: if you go to your settings and let the comment form be embedded (not pop up on a seperate little page if u had that) it works for some of us but not all blogspot users it seems! Worked for this blog :) Here is how to.
And blogger people ARE working to fix this recent issue... A quote from one of the forumposts there:
The unwanted CAPTCHA is the result of a coding / design mistake, that Blogger made earlier this week. They are working on improving it.
The Real Blogger Status ›Confusion From Comments And The CAPTCHA Blogger Help Forum ›Getting Rid of reCAPTCHA ??
I absolutely prefer the popup comment form as you can see the card while commenting. But until then alot of people aren't getting comments from DT's and friends on their blogposts and cards (most challengerules says to turn off verification) and many aren't aware they got a robot-thingy on their blog.. And as it is there because of a blogspot-bug not the blogger him/herself, please take the time and do the captcha verification when u comment, even if it's annoying, hopefully they will fix it soon ¯\_(ツ)_/¯
(Update 12/12 14:00): The CAPTCHA for moderated blogs should now behave as normal. Non moderated blogs are still pending.
TangledBlueRose also has a good soloution which will work for some of us! Thanks :)
If you are on Blogger and posting a comment on another Blogger, just do not enter the 'proof'. It lets you skip it and post the comment if you are Blogger to Blogger. Anything is worth a try :)