I can't get the MAC wallet to work. When I run it I get this error :

Credits-Qt cannot be opened because of a problem.

Check with the developer to make sure Credits-Qt works with this version of OS X. You may need to reinstall the application. Be sure to install any available updates for the application and OS X.

Any got any ideas? I'm running OSX 10.8.5 so reasonably up to date in Macland...