Hay guys, this has only happened recently after I uninstalled UE and reinstalled it due to other problems, now whenever i build lighting it will visually not show some of the lights (meaning the area where the light is will just be black). I have messed around and it worked for about 5 minutes where all of the spot lights and point lights would build completely fine. I managed to do this by duplicating my lights and deleting the old ones, but it just went back to not working again after a few rebuilds. Im really confused as before I uninstalled I didnt have this problem at all. Some of the lights are rebuilding but others arn’t, and i know its nothing to do with the lightmaps etc because they where all rebuilding fine, with shadows etc before I uninstalled.
EDIT: It seems like its building fine for the first few minutes when i first open the project, but it flickers as to what it would build like later on (dark as if there was no lighting)