How can I re-set the App Store so the Updates will again appear under the Updates tab?

Hi,
I am running a Macbook Pro (retina). Lately when I launch App Store and click on Updates the software updates for the software on the Macbook do not show up under the Updates tab. However, when I go to the Purchased tab I see there Update buttons next to programs that have updates ready to download.
How can I re-set the App Store so the Updates will again appear under the Updates tab?
Many Thanks,
David

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