No Longer Receiving Message Notifications on Lock Screen I have a SG3 recently updated to Jelly Bean 4.3. When the update ran, I received message previews on the lock screen, accessed them without trouble, and enjoyed the feature. In the last 24-36 hours, these previews have ceased, and I can no longer swipe to the lock screen where the message previews used to appear. 

The preview setting is still checked, and I continue to receive notifications and previews in my status bar.
Android 4.3 has protection by default to disallow Lock Screen Widgets:



Firstly you need to go to Settings &gt; My Device &gt; Lock Screen as above and enable "Multiple Widgets" 

You can change the SMS notifications in the SMS app > Settings > Notifications

As an alternative for anyone interested I would recommend Dash Clock lock screen Widget 

This is a HIGHLY customisable Lock Screen Widget. You can have SMS/Missed Calls/Stardate (seriously)/Hangouts/Battery and lots more via extensions. You can customise the look and feel of the clock to be JellyBean, KitKat etc too!