Repro steps:

1. Open "gobopass" projects "Main" scene located in "Assets" -> "GOBOPASS" -> "SCENES"
2. Look at the Game view and Scene view
3. Go to "Edit" -> "Project Settings" -> "Player" and enable "Metal Editor support" setting (make sure to do that, before switching platforms)
4. Click "File" -> "Build Settings..." -> Select "WebGL" -> Switch Platform
5. Look at the Game view and Scene view

Expected result: Everything to stay the same
Actual result: All objects become invisible

Reproduced with: 5.6.0a5, 5.6.0a6, 5.6.0b1, 5.6.0b5, 5.6.0f3, 5.6.1p1, 2017.1.0b7, 2017.2.0a1
Regression introduced in: 5.6.0a5
Did not reproduce on: 5.5.3p1, 5.6.0a1, 5.6.0a3

Reproduced on Mac OS 10.12.4

Note: 5.6.0b1, 5.6.0b5, 5.6.0f3, 5.6.1p1 - Object are invisible,but the light that reflects from them is visible