It works here, can you give more details? What mode is Render Selected set to? (for me it was Viewport selection). What version of C4D and what version of Corona? I am not sure what you mean by "selecting a mask did the same", can you break that down into steps on what that was? Do you mean full render, or IR, or both? (I tested full render). Is this on every scene or just in one particular scene? Thanks in advance for the extra details!