Lightmass Build Stuck at 100%

Hi guys,

So I’ve recently been trying to do a very intensive light build and it ended up taking around 40 hours. A ways through the build Unreal became unresponsive and seemingly froze. According to Swarm, the build is complete at 100%, however it seems that it’s stuck on exporting the lightmass information back to the scene. Just curious if this is at all salvageable or if I should just force quit and try to rebuild lighting.