First, I have read that this is commonly associated with having installed a pirated Mac App Store application. I have scoured my system and do not believe that I have downloaded anything third party which was supposed to be a paid application.
When I go to the App Store, there's an update for "Nyan Cat: Lost in space" which I do not have on any of my machines.
Recently installed:
Via App Store:
Radiant Defence (free game)
Disk Art (free program)
DoodleGeddon (free game)
Via 3rd party:
The Walking Dead (via telltalegames.com)
Diablo 3 Public Beta (via Battle.net)
OS X 10.7.3
When I go to the App Store, there's an update for "Nyan Cat: Lost in space" which I do not have on any of my machines.
Recently installed:
Via App Store:
Radiant Defence (free game)
Disk Art (free program)
DoodleGeddon (free game)
Via 3rd party:
The Walking Dead (via telltalegames.com)
Diablo 3 Public Beta (via Battle.net)
OS X 10.7.3