Asked by Anonymous - Mac App Update Stuck In "waiting" Mode :
Trying to update an app on my Mac and the launchpad just shows it stuck on "waiting" and has been there forever. Anyone got any ideas how to get around this issue?
Try going into your activity monitor and kill both tasks: storedownloadd and storeuid. Then go back into the appstore and start it up again.
If all else fails, its time for a reboot :)