Hi!
The problem with hdri maps. Cinema 4d R16 and Corona Alpha4. Everything worked perfectly. But today, when I start rendering , I see only blue sky. In the viewport HDRI maps reflect normal. The settings I change only multiplier in Corona Sky tag (0,1). I don't understand why, in the morning everything worked good.
I reinstalled Cinema 4D to reset the settings and reinstalled Corona. But the problem remained.
Sorry for my english