I'm not sure of what exactly be wrong, but since things are "falling down", do you think that it could be a physics/joints problem? c:
I'm not sure. Did you somehow put the texture in a different folder, or maybe not type them in correctly?
Oh rats! I don't know what else could be wrong... could the textures have been deleted or misplaced by chance?
Oh no! D:
I have had people come to me saying they had the same problem with the model being flattened out, but i have no idea why it happens.