Ive been building new versions of UE4 but keeping older versions for backup. I downloaded and built 4.1 and built a new project for terrain testing. I only have limited memory (4Gb) but at preview build levels would manage to build the lighting for the 4096x4096 map. I then built the updated 4.1.1 code and the editor couldn’t build the lighting any more even at preview level. I then rebuilt the code for the first official 4.1 build and tried to run the lighting again but get the same error log run out of memory and lightmass crashed (also the same for the older build i have 4.0.2). Now when the UE4 loader tool starts it says projects are not associated would i like to update. If i select yes the loader locks up, If i select no the loader locks up. Problems only started after building the 4.1.1 build, any idea’s? If there’s anything that really needs immediate TLC it’s swarm and lightmass, memory management is rubbish, 4GB main mem should be fine (works with every other high level renderer i use, but yet lightmass can’t even do simple scene’s without memory space issues). Please someone tell me a solution or Epic devs put some time into the efficiency of lighting builds.