Steps to reproduce:

1) Download attached project 'TestFrameDebugger.zip' and open in Unity.
2) Open scene 'test'.
3) In Hierarchy tab, click on Main Camera and check if GlobalFog(Script) enabled.
4) Open Frame Debugger and enable it.
5) Check each event and you will notice that Game view doesn't show anything except last event.(see attached gif 'last.gif').
6) Disable GlobalFog(Script) in Main Camera.
7) Check each event with Frame Debugger and you will notice that it works as expected.(see attached gif 'works.gif').

Note: This script was imported from Standard Assets.

Reproduced with: 5.4.0b25, 5.4.0f1.

Not reproduced with: 5.3.5p8.