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With Electrum 2.5.2 and OS/X 10.11.1, selecting Hide Electrum does not hide the window, but instead puts it in the (visible) background and moves me along to the next app in my rotation.
I had this problem several times in a row before posting, including after rebooting my computer. As soon as I posted, I now can not duplicate the problem. So it's at best a rare minor glitch.