the width of the monitor history defaults to about twice the width of the real-time monitor bar that displays next to it and the background of the history defaults to white making it an eye-sore -- after keeping panel settings while upgrading from xubuntu 10.10 to 11.04 to make things worse, it cannot be right-clicked to check if the preferences successfully migrated or to remove it from the panel.
This one is a duplicate of bug #7251
*** This bug has been marked as a duplicate of bug 7251 ***