Okay, I downloaded UE4 and everything was working, then one day I clicked something(have no idea what) accidentally. I didn’t notice right away but the selection outline was not showing in the perspective viewport. So I searched for help, found some helpful ones and altough they worked for others, I did the exact same steps as they did and still no solution. So far I’ve seen 1 person commenting about the solution not working, but no one came up with a solution to his and my problem ever since.
I have just reinstalled UE4 and The Epic Games Launcher and has still not worked with an old project neither with a newly made one.
The ‘solution’ to other people was to go into Edit>>Editor Preferences>>Viewports>>Look and Feel>> and tick the Üse Selection Otline’ and also change the Intensity to something above 0.
Any type of feedback is welcome!
I am having the same issue.
Are you with an AMD video card?
I am with AMD and I read somewhere that this issue came with the new drivers. Currently the version of my driver is 17.4.2. Right now there is a workaround. At the bottom of the Edit>>Editor Preferences>>Viewports>>Look and Feel section there is and arrow (Show Advanced). There you will find a checkbox Highlight Selected Object With Brackets. This will replace the outline with brackets.
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Hey man, you are the best! Going to try your potential solution tomorrow and get back to you, still thank you for answering so clearly!
Hey! Finally got time to try it. It works as promised, thanks!
It doesn’t look fancy like the outline, but will do the job before AMD fixes the drivers 
Hello again! I got around to reinstalling/reseting my PC. So I installed everething back as it was and it works now! First my view of the level wa squite glitchy, but I only had to turn the ‘’‘brackets’ thing off. Hope this helps you too
hey man so selection is working now for you ?
I updated to 4.16 and it’s working for me now