I have a simple cube with simple images as a material. I Uv unwrapped it and I made sure the camera was on for the show in render in the outliner. The first image shows the 3d view, and the second shows the render view. I don't have any nodes because I am in blender render. I also have a motion tracked image but no nodes either.
Possible causes for a Blank render:
No lights in scene.
Objects disabled for Render in outliner (camera icon).
Strips in VSE and Sequencer enabled.
Objects in different layer, or in a layer disabled in Render Layers.
Object blocked by other objects.
Active camera aiming in a different direction.
An object in the scene set as active camera.
Any, some or all of the above.