Posted 31 May 2012 - 04:31 PM
Are you using the editor or the browser to view the content?
If you're using the editor and you can't edit, did the file get locked somehow? (e.g. on Mac OSX Lion, a file is locked after a couple of weeks and to edit, you have to make a duplicate).
Hope this helps.
Author: Head First HTML5 Programming, Head First HTML and CSS, Head First Design Patterns