[outdated, driver version 528.49 appears to work fine] Hi, I recently solved all of my GPU lightmass baking artifacts in UE 5.1 by downgrading my Nvidia driver to version 522.25 after reading Luoshuang’s post on the Epic’s GPUlightmass - Development thread on these forums.
This problem persists even up to driver version 528.02 which I recently tested. Luckily reverting to the aforementioned version solved all of my issues. This is a MAJOR problem that surely affects a lot of people and yet I saw Luoshuang’s post almost by accident after spending a LOT of time investigating this issue.
PS: Just above that post he has another describing how to fix a line of erroneous code by simply editing one of the files, here’s the link to that. - I’m not sure if me doing this played a role in solving my problems, I tried it first and it didn’t fix my issue but after reverting my driver boom everything was perfect.