[OS X Black screen on game start]

I'm having the same issue. I have a late 2013 15" rMBP with a GeForce GT 750M graphics card, and an external DP-connected display at 2560x1440. Here's what my log looks like:

(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

--->TryChangeDisplayMode(Windowed)...
 
(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

--->TryChangeDisplayMode(Windowed) _currentDisplayMode is Fullscreen
 
(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

--->GetDesktopResolution() returning 2560x1440
 
(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

--->GetCorrectWindowedDisplayMode() returning Fullscreen
 
(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

--->TryChangeDisplayMode(Fullscreen) _currentDisplayMode already correct - nothing to do.
 
(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

QuerySomethingChanged() Something changed
 
(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

--->MatchResolutionToIndex(2560x1440) returning 0
 
(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

--->TryChangeResolutionAndDisplayMode(0, Windowed)...
 
(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

--->TryChangeResolutionAndDisplayMode(0, Windowed) _currentResolutionIndex is 0, _currentDisplayMode is Fullscreen
 
(Filename: /Applications/buildAgent/work/d63dfc6385190b60/artifacts/MacStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 49)

--->TryChangeResolutionAndDisplayMode(0, Windowed) already at desired resolution, only changing display mode.

I got 632KB of log file in just a few seconds of running the game...