I’m experiencing same issue as well using Unreal Engine 4.2 on OSX 10.9.3.
I’ve seen one solution to this being disabling (or adding specific allow rules for UnrealLightmass to) OSX firewall however that hasn’t solved issue for me.
We’re looking into this now and will let you know if we’re able to see what’s causing issue. If you are able to narrow down cause at all, please let us know here. Thanks!
Folks, I had this issue and unblocking lightmass in firewall worked for UNREAL EDITOR but I still CANNOT get lights to build in UNREAL TOURNAMENT MAP EDITOR.
Someone mentioned “building lightmass with xcode” but I have no idea what that means or how to go about it. Anyone?
You’re probably facing a different issue than this. Please open a new post with as many details about issue you’re running into now so we can look at it. Thanks!
There are a ton of posts about this already. Seems either people are not getting answers or getting answers that don’t work for them. I am happy to open yet another post about it but then I just end up spending tons of time searching other posts for someone who finally gives an answer to this problem.
This post is originally from April of 2014, very shortly after UE4 was released, so we’d like to take a fresh stab at it. Link your new post here or post it in Bug Reports and I’ll see it and assign it to our staff to look into.