I’m facing this problem since the first build of UE4. Whenever I hit play, my lighting and post processing changes. Here’s a video demonstration of the problem: https://www.youtube.com/watch?v=YRZEm9sXiF8
When editing the level, if I go to game mode, nothing changes. But when I play the game in viewport or new window, the lighting and post process get changed.
I’m using a moveable directional light as sun, with LPV enabled. Using a skylight which is also moveable. No static lighting here.
My specs:
Unreal Engine 4.12.0
Windows 7 service pack 1 64bit
Nvidia Geforce GTX 760 (Latest drivers installed)
Intel core i5 3470
8GB Ram