Read the weight of this problem. https://forum.corona-renderer.com/ Beauty rendering black. Black dots appearing... #msg143559
Did you manage to solve it? I have it, too.
Cinema 4d R21. 207
Corona 5 hotfix 2
Hi, these are NaNs by the look of them. Could you possibly try out the V6 daily build found here: Daily - Google Drive and let us know if that helps at all?