Default [Q] Message preview not working after update to 4.3

Hi everybody, hope you're all good in 2014

I've noticed an issue with message preview on lock screen after upgrading to 4.3. When I receive a massage / FB notification etc, I get message on the screen and notification bar. When I click on it, I get an empty box is popping out - no preview, nothing. Same with missed calls?
I've turned message preview off for now, but I would like to be able to use this feature without issues?

Thanks