I can't download the latest security update to my iMac with Yosemite 10.10.1

I can't download the latest security update to my iMac with Yosemite 10.10.1

Hi mesuno.  I can't download the update either.  When I click on "Update" I see the download progress bar for only a fraction of a second.  Then I get a message in the "updates installed" area saying that the update has been installed.  Then the Security Update notice returns and so does the "Update" button.  Then I press "Update" again and the same thing happens.  I can do this ad infinitum.
The system seems to be confused.  I have several entries in the "installed" area saying that it has been installed, but still the "Update" button persists.  When I check with "Sytem information" there is no record of the installation.
Is there something wrong with the App Store app, or does anyone else have a better idea?

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