Reproduction steps:
1. Open "Test001" project
2. Open "Test" scene
3. Drag and drop "runningcat" sprite to scene view
4. Run the scene
Notice: the sprite lost its colours and become pink

Expected: Sprite does not change colours
Actual: Sprite turned pink

Reproduced on versions: 5.4.0b12, 5.4.0b14, 5.4.0b17

Note: On Unity versions 5.3.4f1, 5.3.4p5 works as it should

Note: on Unity 5.3 sprites does not change colours, 5.4 sprites becomes pink after playing the scene