This is on the 4.11 promoted build. When I download, run setup.bat, generate project files, and build. Somewhere along the line it doesn’t get any of the lightmass files shown below, they’re just missing all together.
I looked around and saw loads of other people with the [lightmass swarm failed to kick off] error and tried the solutions before I found out that my executable and dll’s were missing. My friend copied the files from his 4.9 project into my promoted unreal/binaries folder and now lightmass works fine again.
Another thing to note, upon launching the engine on a clean project just after build and before pasting lightmass files in I noticed some dynamic shadow errors. I want to confirm that these only exist for me in 4.11.0 and not in my 4.9