Double click on Dock to open an app?  Seems a change from 10.6.8.

Is it now necessary to double click on an icon in the Dock to open an app?  When did this change get made?  I find it more inconvenient compared to the single click on 10.6.8.  But then again I found 10.6.8 more convenient in general.  Hated losing virtual desktop grid and Back to My Mac.

Thanks for poking me to look at the console logs! That led me to find the error message:
App Store[762] <Error>: CGBitmapContextGetBitsPerComponent: invalid context 0x112f90060
Which in turn pointed me to https://discussions.apple.com/message/15431640#15431640
Renabling Spotlight (see http://osxdaily.com/2011/12/10/disable-or-enable-spotlight-in-mac-os-x-lion/ ) allowed the App Store to work again!
Just why the App Store requires Spotlight to work is beyond me.

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