Epic's GPUlightmass

Looks like I made a big mistake updating my project to 5.1.1,

Some of my emissive materials do not seem to work at all. I can’t figure out the reason why or a workaround.

5.0.3

5.1.1

My clear glass also doesn’t seem to let any light through

5.0.3

5.1.1

I also seem to have an issue where building reflection captures seems to destroy all the lightmaps. When that happens, I can exit without saving and try again, and then it usually works. I haven’t found the pattern yet, but it is happening to me quite a lot.

I am using Nvidia driver 522.25.