This applies to Mac Games Arcade only.

There seems to be an issue with Crazy Machines when it is installed in a folder deep within the system. To fix this issue, go to My Games and control click on the game until it says "Reveal In Finder". This will show you where the game is installed. Drag the game to your Applications folder. Now go to My Games and click on Delete to delete Crazy Machines.

Now DRAG Crazy Machines (that is now in the Applications folder) back to the My Games window. It will install it again into My Games.