Add Actor Child component un-editable

Hi, im new to UE4 and was following the endless runner tutorial, i decided to add a custom obstacle using the same method as other obstacles and this happens

as you can see, i can’t edit or set the child actor class, the whole thing is greyed out, i recompiled re saved everything but still no use.

well, this is awkward but i restarted unreal and it works now.

Strange. I had similar issue where “Add Component” button was greyed out for everything, closing unreal and opening project again fixed it. =/ ??

This happened to me and it was because I was still in “play mode” within the editor. Silly stuff!

-HD’s answer is very likely the right answer. The same thing was happening where the “Add Component” button was disabled for me in my new Pawn BP class that I had just added. Switching back to the game viewport and stopping the running game made it so that the “Add Component” button was correctly enabled.