Mac app store runs/searches continuously - force quit

Question

I was notified there is an update through the Mac App Store. However, when I enter the store and then the updates, it continuously searches and never stops (well, for and hour I let it run). I cannot stop the search nor can I install the update I was notified existed. The app must be force-quit to exit as 'Quit' and 'red dot' do nothing. How can I get the app to complete its search and/or install the existing update?
MacBook Air

Answer 1

This procedure will delete certain temporary and cache files used by system processes. The files are automatically generated and don't contain any of your data. Occasionally they can become corrupt and cause problems such as yours.
Back up all data before proceeding.
Triple-click anywhere in the line below on this page to select it:
/var/folders/zz
Right-click or control-click the highlighted line and select
          Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with a subfolder named "zz" selected. Move that subfolder to the Trash. You may be prompted for your administrator login password. Restart the computer and empty the Trash.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination  command-C. In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.