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1. In IE9 Standards Mode, even same-origin stylesheets will be ignored unless they are delivered with a text/css MIME type.
2. SCRIPT elements will reject responses with incorrect MIME types if the server specifies X-Content-Type-Options: nosniff.
3. Documents delivered with a text/plain MIME type will not be MIME-sniffed to another type.
And the moral of the story is - make sure your server MIME types are properly set for all files. You may be seeing fails where previously were none.