Why can't I drag my Blueprint components?

Development Programming & Scripting Blueprint
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1

I am new to UE4. I started by following the “Vehicles in UE4” tutorial. I followed the instructions accurately and everything was going well. Until the step when we need to add the Camera and attach it to the SpringArm. The Camera is created but I can’t drag and drop it on the SpringArm. The component is simply un-draggable.

I also noticed that the “Compile” button is disabled. When I hover over it, a message “Dirty: needs to be recompiled” is displayed. I don’t know if these 2 issues are related but I noticed in the video tutorial that the Compile button is enabled.

What might be the problem here?

2

I restarted the editor and everything went fine. Strange!

3

Encountered the same problem today, it’s because the game or simulation is running in the viewport. Stop it and it should work again.