On a Mac, Following the tutorial located here:

When opening a new level, the atmospheric fog renders solid red. Adjusting the Density Height in the Precompute Params alleviates the problem (unless you delete the atmospheric fog and start over.)

Steps to Reproduce

On a Mac, Open a blank project in UE4.5.1
Open a new level
Add BSP ground plane to grid
Add Directional Light
Add Atmospheric Fog
Note the Fog renders almost solid Red
Adjust Density Height in the Precompute Params
Fog will now render correctly

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ComponentUE - Platform - Apple
Affects Versions4.
Target Fix4.7
Fix Commit2365127
CreatedNov 14, 2014
ResolvedNov 19, 2014
UpdatedApr 27, 2018
View Jira Issue