At work I have a 2011 iMac running the latest version of Yosemite. I am having an odd and annoying issue when trying to select a contiguous or sequential list of files. If I use shift-up arrow to select a list of files I am able to select them with no problems. If I use shift-down arrow I hear VoiceOver say "help menu" and the help menu from the menu bar opens up. This happens whether quick nav is turned on or off. Does anybody have a clue as to why this is happening?