You seem to be describing the content of the navigation bar at the top of each message page. There are no fancy unicode symbols there. The lights are being displayed in a separate frame, and nothing about main page of the message board or the message pages has been changed. That's why I don't think it's a font problemI'm thinking that your Linux browser has problems with frames. No one except HTML dinosaurs like me uses frames any more. I'd guess that there's a bug in your browser that no one cares enough about to fix.