2d sprite sheets render as black boxes

Hi guys, was making an animated gallery app exporting sprite sheets from flash, into unity. when I was using 4.3 everything thing went smoothly and the apk rendered the sprites perfectly at the import settings of 4096 / True color. My tablet had no problem playing the app.

When I upgraded to 4.5 suddenly every 2d sprite based app I had rendered black boxes instead of my characters. Just looking for some answers and have already tried to re import, hell I just remade a whole project and it still won't work right. Can anyone help?

 

Try altering the shaders being used for the sprite sheets