This is also happening to me on two different sites, using two different themes (including the default theme).
Older version – http://downloads.wp.xz.cn/plugin/jetpack.1.2.2.zip
Same thing at texasmusicaltheatreworkshop.com
Rolling back now.
Same here, I’m using Suffusion 4.x and lost my “magazine” template home page had to disable Jetpack
Sorry about that! This is all fixed now, please update to Jetpack 1.2.4.
Yesterday I updated to Jetpack 1.2.4 and this is clearly not all fixed as my website comes up blank (except for the header and nav menu) when Jetpack is activated. Even though I have it deactivated now, something still seems to be interfering with my other plugins. I posted here: http://ww.wp.xz.cn/support/topic/jetpack-ruined-my-site?replies=2
Help or some kind of update would be appreciated.