I'm not moodflow, but I'll try to answer.
In the Default Shader or ImageMap Shader (Default shader is best so you can use displacement maps) inside of the Multishader, make sure the image is selected by browsing for it. Then, check to see if you have the Projection Type set where you want it, which I think will probably be Through Camera. On the images I've used, I don't mess with the Alphas (usually), so that should keep you pretty plain and not fancy. Nevertheless, the key (after ordering the MTL) is to get the textures in the right order in the Multishader as in the MTL and make sure you can see the Multishader's individual textures.
For images in the Default Shader, choose a color image and set your Diffuse to 1. Do the same in Luminosity (at the bottom of the same page) and start with a 1 value there. Once this is done, go to the Displacement tab, choose a BUMP image and set the Displacement multiplier for a .05 to begin. Play with these values until you see them like you want in the preview window and, of course, for your final render.
Hope this helps and is not redundant information for you.