Hello,
Thanks for the screens. Now I see what you mean. I am sorry that I misunderstood what you said with a quite different thing. I though you were referring to the gear icon being grayed out in the inspector of some action clip, while this part of the UI is on a different place.
Please open up CutsceneTrack.cs and at about line #455, please change it to be like the following code.
I intentionally commented out the old code to make it easier for you to find and see the changes.