Jetpack, the popular stats plugin for WordPress, has released several updates recently. The latest, which came yesterday, January 6th, brought an unwelcome gift for those who have upgraded to the recent WordPress 3.5 platform. The latest version of Jetpack, 2.1.1, disables some key functionality within WordPress — namely the ability to add media.
It seems that uninstalling Jetpack is not enough and you will be required to re-install WordPress 3.5. It doesn’t look like it affects all installs since I’m using both version without any issues (that I’ve noticed). If you haven’t updated you might want to wait a bit, just in case. Follow this link above for the full Report.