My code is exactly as Ben’s code (I even compared it using github), but my crosshair won’t turn into green or yellow, and neither me nor the AI tanks are able to shoot.
My Unreal version is currently 4.18.3.
I have had the same issue/bug. The simple fix is to delete and reattach the aiming component to the tank blueprint. Here is where I found the solution: https://answers.unrealengine.com/questions/150216/uactorcomponent-not-ticking.html (Scroll down to Name368’s reply, where he states “I had problem with ticking component too… i just deleted and added new in BP and now everything works… some kind of bug (before i turned off tick in cpp and when i turned it on again, it doesnt worked).”)
Hope this helps. 