Mac App Store sign-in problem

I allowed Mac App Store to download and auto-install OS X 9 Mavericks. Now when I try to download the installer to use on a backup external hard drive partition, I'm required to 'sign-in'.  When the "Sign in to download from the App Store" dropdown appears, it already has someone's email address in it, greyed out.  I can't click to put the insertion point into that box, so I can't log in.  The email address pre-positioned in it is "[email protected]".  Have I somehow been hacked during the install?

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