Building Light: Lightmass crashes swarm agent

So I've done quite a bit to fix this, but have had no luck what so ever.
unreallightmass.exe swarmagent.exe and swarmcoordinator.exe are all exceptions added on my firewall
I tried deleting them all, and validating files on steam.
I've reinstalled the game and the sdk tools.
There is no log file, as swarm agent crashes immediately upon building light with lightmass checked.
This happens on my map, stock maps, and a new empty map.
I can build light without lightmass checked.
I can't even open swarm agent to find the cache folder location, and purge/validate

Does anyone have any further input on this?

Building Light: Lightmass crashes swarm agent