How to reproduce:
1. Create new Unity project
2. Go to File --> Build Settings and enter Player Settings
3. Make sure that Display Resolution Dialog setting is Enabled
4. Go to Other Settings and set Graphics API for Mac to Metal
5. Build And Run project
6. When Resolution Dialog appears, choose non-native screen resolution and make sure that Windowed mode is not checked
7. Press Play

Expected result: Splash screen appears, game is rendered
Actual result: Splash screen doesn't appear, black screen appears, game is not rendered

Notes - Pressing CMD+F twice (going to windowed mode and going back to full-screen) seems to fix the issue

Regression introduced in - 2017.1.0b4
Reproducible with - 2017.2.0a1, 2017.1.0b7, 2017.1.0b5
Not reproducible with - 2017.1.0b3, 5.6.1p1