Why doesn't my unwrapped model appear in the UV Editor? I'm trying to unwrap a cube (I know, super complicated). I've got the seams marked, the UV editor open in a 2nd window, and all the geo highlighted. When I tell the cube to unwrap nothing happens. That's pretty much the long and short of the problem. Now I've been working off this one file for a couple weeks now, saving it off the original file and continuously cloning geometry. It's entirely possible I did something, pressed a button, something. 

Any thoughts.
To unwrap UV's, you mark any seams you want, select the faces you want to unwrap, press U and select one of the unwrap options while in edit mode.

Only selected faces (or those surrounded by selected vertices/edges) will be unwrapped. Only selected faces will show up in the UV editor.

Also UV's aren't displayed in the UV/image editor if the Render Result is displayed in the UV/Image Editor. You need to select an image or click the X to close the render result to see UV's.