I cannot get background images to show up. From what I understand you add the background image, then set the view it shows up in and then use numpad to set your camera view, yet this does not work for me. I've tried the 'ortho' and 'persp' views, along with the 'front', 'back' and 'sides' angles using the numpad, but cannot see any image. Also, setting which view the image shows in has no effect.
I have also tried dragging and dropping a image in, with no luck. I understand I can also add a image to a empty plane, but even this way does not work.
On the other hand, when it comes to adding materials and textures to objects, everything looks fine in edit mode and the final render, so this is not a problem.