Hi Capt!
Not using oculus, so that isn’t the issue. These seemed to break earlier on before changing settings so those were still at default. We are using swarm over multiple pcs though and do have some lightmaps that go up to 4096 in size, so those are similarities. I also have complex geometry in the scene as you do, although this wasn’t happening until recently so that and the higher lightmap size were never a problem before. The only more recent addition is distributed rendering, even though turning that off doesn’t seem to fix things once they are broken.