OK, I understand what the messages means, but I\'m really not sure what\'s causing it. I\'m using Safari and the Web Inspector on Mac OS X, by the way.
I found out that the naming of my css files was in conflict with the proxy filters
www.dating.com (which is not my site) was blocked and my css and js files were called dating.css and dating.js. The filter was blocking this. Maybe that is the case with some of you, working on corporates systems.