Reproduction steps:
1. Download "Highlighting system" asset form the asset store.
2. Build and run the first scene.
3. Notice the black spots on the scene(repro.png).

Notes:

• Firefox(Windows) - black spots everywhere.
• Chrome(Win,Mac), Safari(Mac), Firefox(Mac) - highlighting doesn't work at all, but there is no black spots - may be a different issue(repron.png)(Mode switching may fix it).
• Tested with GeForce 750TI and Radeon R7 370.

Regression introduced in: 5.4

• Highlighting doesn't show up in 5.4.0 up to b13 in editor and WebGL build.
• Everything works as expected in 5.3.5p3

Old reproduction steps:
1. Open "New Unity Project 34" attached project.
2. Open "Scenes/MainMenu" scene.
3. Play the scene.
4. Notice how it looks(picture attached).
5. Build and run it for "WebGL" platform.
6. Notice the black screen(picture attached).