Keeping the textures on

[dirtpile]

Hey, I painted some labels as textures on my model using the zapplink in zbrush. When I render it, one subtool seems to be missing its texture. The rest of the model is fine. I couldn't figure out why, cause I used the same process for the whole model. 
Screenshot here:
https://drive.google.com/file/d/0B8KJqqI-48aaeWo4NjI5Qm1seTg/view?usp=sharing
Also, when I apply a material in keyshot, it paints over the texture and the labels are gone. Is it how it's supposed to work or is there a way to keep the labels?