I can't get shift-+ or shift+; to print to the screen. Nothing gets printed. Shift-<other keys> works as expected. Without '+' and ':' it is quite limited. Is

I can't get shift-+ or shift+; to print to the screen. Nothing gets printed. Shift-<other keys> works as expected. Without '+' and ':' it is quite limited. Is this a problem on my end? FF3.1 Leopard.