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クロスドメインのセキュリティ・ポリシーが変更されたみたいなそんなことが原因らしい。

fontフォルダの直下に以下の.htaccessをぶっこめばおk

<FilesMatch "\.(ttf|otf|eot|woff)$">
  <IfModule mod_headers.c>
    Header set Access-Control-Allow-Origin "*"
  </IfModule>
</FilesMatch>

参考:CSS3117 in IE9 and IE10: @font-face failed cross-origin request errors

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