Hello,
I downloaded the latest 4.12 executable, 4.12.4_4.0.282, and installed it on UE 4.12.5. It looks like I’m missing some Vector Parameters in the trueSkyMaterialParameters collection file. CloudShadowOrigin, CloudShadowScale and LocalWetness to name a few. Also, the sun isn’t rendering properly - see attached image. Any ideas what could be causing these issues? 