It's working correctly. Shatter simulations always start at the beginning and at the place where you parked your current time indicator the pieces already have fallen off the canvas. You need to animate the strengts of the forces to get a different timing or work with split layers.
it doesn't show at all throughout? where and what do I need to change? where is it on the canvas because ive scrolled throughout and it doesn't show?
here's a comprehensive page on shatter effect where will find professional tutorials from respected authors: http://www.provideocoalition.com/shatter-glass-in-after-effects/
here's the adobe help files about shatter:
as for your setup - it appears you have trimmed your text layer
as M said, shatter will start at the beginning of each layer so you should trim it back to the beginning. just drag the beginning edge of the layer to the start of your timeline. or you can always start over and create a new text layer only this time don't trim it at a further point in time.