Can't launch system monitor under Ubuntu

Can't launch system monitor under Ubuntu Since I upgraded to Ubuntu Karmic (fresh install from disc), I haven't been able to launch the system monitor. Nothing happens if I launch it via the Applications menu on the top. If I try to launch it via the terminal, I get this output:
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Guest [Entry]

"This may help: http://ubuntuforumsdotorg/showthread.php?t=1289649

You can try changing the theme and (if enabled) disabling the global menu bar."