So you are using a swarm coordinator to distribute the bake to other computers? What does it say in the log tab? (Double click the swarm agent icon in the system tray).
You can also try to ping the coordinator and the blades in the menu -> Network there. Check it in the log tab again.
When ever something weird happens it sometimes helps to clean out the cache. Go to Cache -> Clean.
Most likely it might just be too much data and too big light maps. I had it hanging when we just had too big light maps everywhere. Have you got any messages before the light build kicks off? See if there is something in the list that might stop it from baking. I personally never change the settings in the ini file and I don’t get bad results. Production is already a high setting so probably try to start a “Production bake” with normal ini settings and see how it looks.
In my projects I hardly ever set any light map higher than 1024. For furniture pieces probably never higher than 256. It’s more about the quality of the light map. If you have connected charts “around a corner” setting the light map to 4096 will not fix it. You need to fix the light map itself.
Finally another thought: Are you using 4.11? There was a bug where the editor would crash after building the lighting when you had a level hidden.