Local server giving wrong files. Is it possible I'm running 2 python servers?
I recently had this problem and it was due to the old page being stored in the browser cache. Accessing the port from a different browser worked for me (or you can clear your cache).
I'm in the directory /backbone/ which has a main.js file within scripts.  I run python -m SimpleHTTPServer from the backbone directory and display it in the browser and the console reads the error $ is not defined and references a completely different main.js file from something I was working on days ago with a local python server.
I am new to this and don't have an idea what's going on.  Would love some suggestions if you have time.