Mine's started failing for no apparent reason, doesn't even start at all now. When it did choose to work, it wouldn't show the FPS overlay so it was kind of useless. Might reinstall.
EDIT: Still runs in task manager, but when I kill it since it's not running anyway, MSN/TaskManager/Firefox even all stop responding :s
EDIT2: Um, apparently it's working fine now.. just takes ages to startup..? Curious.