UE4 - Lighting goes through walls

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In the aforementioned post, I discussed that I was building my project on a Mac. Once I got it built, I found that the lighting was going through walls:

Light ON:



Light OFF:

This was to do with when building all the project (compiling the shaders etc) the engine slowed to a crawl and it was suggested to me to reduce the settings which I did. Turns out the fix is to set the shadow quality from low to medium (or higher):

Shadow Quality LOW:



Shadow Quality MEDIUM:

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