Ok, just tried it with a new scene and it is working now. Don't know why it wasn't in the previous scene.
Another question if I may - even using a fairly high resolution texture (1024 x 1024), after I blur my lines (to fade in and out of the shadow, I'm trying to do some inner chest muscles), the bumpstarts to look pixelated when I render. Are there any ways to avoid this, or are normal maps a better solution? I'm hoping there's a way to sort the bumps, since I've not looked at normal mapping yet.
Here's an image to show you what I mean: