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There must be a simple reason but I have been unable to find anything about this particular problem after numerous Google searches.
I am aware that some people have this problem because of comments at the top of a CSS document, but I have none of those. And I also know it's not a caching problem.
Could it be a character encoding problem? A link tag problem? Something to do with the web server?
Just a couple of ideas... Have you got the 'case' correct? eg. "mystyles.css" and "myStyles.css" could be considered the same when working offline under Windows, but not online under Linux. Are you using '/' (forward slashes) in your directory path, as opposed to '\' (Windows back slashes)? '\' will work under IE, but not FF.