Device view is not a currently an open source view. I have heard they are ridding a few bugs but it will be released soon.
Next time you see something not loading, be sure to check the directory, to ensure the file actually exists.
I have found debugging a bit tricky thus far using famous. Really for your problem, only the console would give you what you are looking for. In the case of a view, if it is not showing up how I expect, I often drop an id or class into the view, so it because searchable in the DOM.
Creating better debugging tools would add to the the long list of things famo.us is looking to build in the coming months. As an early adopter, it's a bit of a tough road.
Good Luck!