Before we were having issues with Firefox not loading the font files, but that turned out to be some kind of MIME type issue that their IT guy fixed. Now, however, using Firebug, I can see that the font files are definitely being loaded, but not being displayed. Any text that references the @font-face style blanks on first load and then just loads the default font.
I thought it may have been their server (after the MIME type issues), so I created a test page (located HERE) with just the bare minimum of stuff on it to test and see if the fonts would display. Somehow, they do, so it appears to be a WordPress issue. Although, I don't know what to do about it because it's the same way that I've always used @font-face, just on a client's server rather than a legitimate host.
Does anybody have any suggestion as to what's going on here? I'd be happy to provide more code if that helps, but I have no idea what else could be affecting it.