I had a same problem and solved it. The issue was that I was working on a localhost instead of a real domain.
Some parts of Jetpack cannot work locally ( https://wordpress.stackexchange.com/questions/42352/jetpack-running-locally ), and also some part’s cannot work if you do not have wordpress.com account connected to your Jetpack installation. So you will probably need to install Jetpack on some real domain and during installation it will ask you to connect to your wordpress.com account.
Also, go to to Jetpack > Debug (you’ll find small “Debug” link at the bottom of the page) and see if there’s any errors. If you see some – click on it and it will expand and show additional information about the problem.
Hope this will help someone.
