Oh. I am so sorry. I meant to say that Notifications are NOT coming on the lock screen. I was expecting that gmail and Hangout notifications would show on the Lock screen. It is not. When i get a hangout message, it just shows a small icon on the left top of the screen. I have to login with my PIN to see the actual message etc. Not sure what setting i am missing here.
I am now on Lollipop 5.1.1. In the 'Screen Lock & Password' setting menu, I have enabled the following :-
'Notifications turn on screen'
'Show detailed notifications'.
Sometimes, I see the whatapp messages show up on the LockScreen. But, the Hangout SMS's never show up or gmail etc.