[opm]

Not confirm, the problem still exists.

[tom]

Could you send me a scene having this problem?

[opm]

Yes I can, mxs or c4d ?

[trofaster]

I confirm that the problem persists - still black spots in the scene linked in the first post of this thread.

[Bubbaloo]

Here's a render with one black dot showing up. The only illumination in the scene is a large emitter plane made of one poly. There is no SSS but there is a thin sheet of high grade glass (on the top face). The black dot showed up after I added the glass piece. I haven't re rendered the same scene again yet to see if it reappears or multiplies.

[NoahPhense]

Did you try wiping the camera lens?

- np