I can't view your CAPX but just some silly suggestions to check:
If your sprites have a blank frame at the beginning they will be blank in the layout.
If you accidentally changed image points they may be way off the layout screen.
If your layout settings for that sprite are itty bitty you may not find the sprite.
If you have a sprite covering them they can be hidden on the layout.
If you have the layer the sprite is on set to invisible you won't see them.
I know those are newbie probs but I still make those mistakes all the time.
Now where is that dang sprite!