I posted this over on the NEXT Beta forum, but I haven’t gotten any help. One machine and using Bucket BF+LC. I am getting dark boxes randomly across my image. This was a DR issue years ago, so I don’t know why it is happening now.
Is the light cache generating fresh everytime or is it accessing a saved cache that the DR nodes cant read?
I am assuming fresh since I am not using DR.
I’ve replied in your original thread this morning. There is no reason to create 2 identical threads.
When I have a deadline and I need help, I felt that there was a need for another post.
You are using a beta build in production? #YOLO much? 
No, never!
I’ve had similar Problems in very rare cases when using Adaptive Lights at low settings (global switches) but with 3.60.04. Does it help if you set it to full light evaluation?
I used all the defaults. Can you elaborate?
Thank you, I’ll give it a try.
Getting weird dark blocks all over my animation with the adaptive lights default setting in version 4.02.04. Why is this still an issue?
Because everytime you want to make something smart in software development it occasionally fails and is dumb. 
I am getting these bad in my element passes. I think it is the same thing going on but on my reflection and specular passes.
I just got these this morning again. It’s due to adaptive dome light (WIP) thing. I think they fixed it but I still use 4.02.04, not sure if it’s fixed in and newer versions. They say it’s due to objects that don’t cast shadows but it wasn’t that in my scenes.
Can’t test this now, but I think mine appeared when I added a second dome light just for reflections and turned of the reflection in the first one.
I am having the same issue on my current project and it is the adaptive skydome with HDRI. I didn’t try it with V-Ray Sun/Sky or going to the full evaluation, but turning it off did solve it.