It's unlikely to be the Mali 400 itself -- because it's definitely possible to draw things on the screen. I mean, really... what are the chances that someone's shipped a whole series of phones that can't render anything to the screen? Wouldn't someone else have noticed? Isn't a chip that used in a billion phones likely to have been a little bit tested?
Isn't it more likely that it's your application?
If you post the source, we could have a look at it for you.