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...