I recently found out that for visitors using Internet Explorer the header for these pages was behaving badly: the logo was flush left and the menu strip was wider than the screen! Eeeek. :(
I had tested the site on MANY browsers, and every one was showing the same correct layout, so I just assumed it was working fine. But then IE had to throw a spanner in the works with its own interpretation of the CSS.
I have managed to tweak the CSS stylesheet and the layout so that the page still loooks the same in all other browsers, but now it also displays properly in Explorer. YAY! :)
Oh, well - back to the fonts!