Fracture not rendering in sequence

[Cuppacool]

Im trying to render a fracture in sequence but it doesnt explode, it just animates to a static part of the explosion or sometimes it doesnt show at all.

Im played with the LODs and the Async and the preroll but nothing works.

Any help would be great appreciated (ignore the lightning)

■■■■ rock!!!

Thanks

This is how it looks when rendered

or like this

But what I want is this