Hello wukakuki,
Whenever you build lighting you will notice that it says building status very briefly before the windows come up telling you the percentage of the light build. In the bottom right of your computer screen an icon will appear that’s black and yellow. That is your swarm agent. You can open that and watch the build progress on your machine.
We tested this exact issue on another machine that is using the 10.11 beta and we were able to build lighting. Not too sure what is causing this.