I’m actually experiencing the same issue now. At first the arrow was only twitching, but now it doesn’t even appear. I tried everything you guys said apart from checking if Real Time Capture is enabled because I can’t find it 
I tried doing it on different map in the same project and it worked. Only on my new, empty one, it doesn’t. I only have a sphere and DirectonalLight placed there. Bamboozled!
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