Unity MAC application quits on launch

I’m developing a game on for the Mac App Store with Unity and when I launch my build it literally then immediately closes itself… I don’t even get to the splash screen and I don’t even get a crash window or any notification. It appears in the dock for half a second and then just quits… :confused:

There’s nothing related to the app within the diagnotics folder (~/Library/Logs/DiagnosticReports/) so I’m kind of stuck… it works fine within the Unity Editor and within a webplayer build…

I’ve tried deleting the Application Saved State directory (~/Library/Saved Application State/) but that also hasn’t rectified the issue…

Anyone come across this or have any ideas?

Turns out this is because the application is unsigned and is returning an exit code of 173 (via Console.app)