It must be operating system related. what is your operating system?
I understand Linux normally have their own icons but I can't check it without booting up a live DVD.
Have you disabled all Add-ons to see if it makes any difference? Add-Ons must be the first thing everybody should check as they cause more problems than solve anything useful. I don't use any Add-Ons but that's me because I have always said that if the App can't do the things for me out of the box, then that App is not good for me. Period.