The company I am working for bought a font at myfonts.com. They included a javascript to make it working for different browsers.
The font is currently working in various browsers. Even in Internet Explorer partly. But it is not working with Internet Explorer on subpages different than the frontpage.
I already tried to contact the myfonts.com support. They said it has something to do with javascript errors on the subpages. But when I checked them no errors appeared at all. So I am not sure if it has something to do with that.
http://blog.twostepmedia.co.uk/how-do-i-use-font-face-correctly-across-most-browsers/
Give this guide a try