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Um...mine doesn't work like that - hovering over the program icon, program name, or the arrow does nothing - but when I click on the arrow the list opens.
Don't think it's ever done anything else, but I have to say I prefer it like this - "hover to open" is a PITA (particularly on a touch screen, not that mine is).
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...