As the title says, trying to build a level results in the build process stopping when the Swarm Connection set up reaches 100%. Since you can’t interact with the engine until this dialog box goes away, I’m forced to end the process through Task Manager. This happens on blank maps, my maps and the maps that ship with Unreal Tournament. According to Task Manager, the engine hasn’t actually crashed.
My computer crashed and I had to restart. Since the restart, UE4 has been able to build the lighting properly. I can only assume that some sort of resource that UE4 required was being used and the restart freed it up.
Going to try this myself and see if it works since I now have the same problem ever since updating my sourcebuilt engine to 4.14(Unmodified) Edit Worked like a charm, thank you very much!
Heh, glad I could help somebody 2 years into the future!