When I got your message, I went to the page and saw the same thing.
I hit reload and all the boxes disappeared, the accented text displayed okay
This is in IE8.
Just noticed similar problem in Mozilla. First loaded the page, the accented characters showed up not as boxes but some other weird character. Hit reload, they worked okay. Hit reload again, back to broken and multiple reloads stays broken. Left it for a minute, went to IE, came back to Mozilla, hit reload, fixed again. So both browsers reporting similar issue.
Do you see same problem in both browsers?