Hi guys!!!
I have been struggling with an issue for a couple days now, and if there is anyone that has an answer to my problem I’m begging you to tell me 
No matter what I do I keep getting black artifacts at the bottom of my boxes (see below)
I’m building at production settings
Scale = 0.2
Indirect Bounces = 30
Quality = 2.0
Smoothing = 1
I’m not currently using portals and I’m using 4.11
My lightmaps are solid. The roof, floor and each wall are all separate lightmaps. The boxes are set to 512 as well. I assure you I did not start off with a 512 lightmap for a box lol
I have tested the whole scene with 2k lightmaps. I have tried about every setting I can think of. I have tried positioning the boxes below, above and aligned with the floor. When I turn the lightmaps up the black lines become even more noticeable.
Thanks for any help