Quite often when I log in, I don't have any FuXP text on FuBar. The xp/rep bar is there, but I have to right-click FuBar and unselect and reselect FuXP to get the text to appear.
This happens to me too. The icon and the rep bar for the current active faction are always shown correctly, but sometimes no text appears beside the icon.
EDIT: Corrected a wrong word. Poor, poor English of mine. :D