I highly doubt it is related to the broker window. I strongly suspect it has more to do with each character having its own .ini file and that the window settings for the character you logged onto that the xp bar wwas missing is to blame. Try doing alt+~ to see if that brings it back, if not, you may have to delete the .ini file for that toon and start from scratch on the window placements/settings for that toon.
Duckstomper
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