Do you get any error message? Can you please try clearing out your cache?
Do you also encounter this issue in a different browser? for example Firefox or Google Chrome?
Could you try and disable all other plugins and reactivate Jetpack. This way we can see if other plugins interfere with Jetpack.
Also make sure you are running the latest WordPress and Jetpack version:
http://www.wordpress.org
http://www.jetpack.me
Looking forward to your reply.