Textures not rendering but visible in viewport


Hi all,

I have a car model that uses a mixture of PNG textures as well as TIF textures that utilise the layerset picker in the material editor, allowing me to create multiple textures from the layers in 1 TIF file.

Are there any limitations on the number of textures I can apply to my model with selection tags before it stops rendering properly? The image from the viewport is totally fine, but when I hit render certain textures appear grey, horrible resolution (carbon fibre) or simply black.

Any help greatly appreciated, images below: