I don't have any black in the scene. There is a blue skysphere
surrounding everything.
After trying everything I could think of with adc_bailout and max trace
level, I think I finally found out what was the problem: I was using a
media statement with multiple densities (3.6.2.3.4). With no direct
lighting to provide some colour, a few spots had 0 colour. I still don't
understand why it didn't antialias with surrounding pixels (I was using AA
0.3) though.
So, work around: add a weak light, so that all points have some light, or
split your media statements, although that will affect the final media
result.

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