I am not sure if this is a bug or I am doing something wrong, but..
I right click on my index.html and Open in Browser.. starts up the internal webserver
http://localhost:63342/projectname/index.html and none of the relative css files styles apply (css/stylesheet.css)
i see them in the web inspector loaded fine, but none applied to the DOM objects. (chrome or firefox same behavior)
i open the file directly in browser (eg file:// ) they are all fine and i make them absolute to a remote webserver and they load fine, so that makes me think it is a bug somehow with the local webserver.