Errors appear in the Xcode Console when User's project is run on iOS:
2017-04-19 12:55:18.131719+0300 KneeViewer[346:45705] Execution of the command buffer was aborted due to an error during execution. Caused GPU Hang Error (IOAF code 3)

Steps to reproduce:
1. Open User's attached project
2. Make sure the Graphics APIs is set to Metal
3. Run on iPad

Result: Errors appear in the Xcode Console: 2017-04-19 12:55:18.131719+0300 KneeViewer[346:45705] Execution of the command buffer was aborted due to an error during execution. Caused GPU Hang Error (IOAF code 3). iPad screen is black.

Reproduced with: 5.6.0f3, 5.6.0p2
Not reproduced with: 2017.1.0b1 (due to errors in the Console), 5.5.3f1 (works as expected).

Tested with:
iPad Mini 2 | iOS10.3.1 | reproduced
iPad Mini 2 | iOS10.2.1 | not reproduced
iPad Mini 4 | iOS9.3.2 | not reproduced
iPad Pro | iOS10.2 | not reproduced
iPhone 6 | iOS10.3.1 | not reproduced
iPhone 6S | iOS10.3 | not reproduced

Workaround: change graphics API to OpenGLES2 or OpenGLES3.

Note: the issue only reproduces on Metal.