I compiled my map and received several overlay errors on my compile log, I fixed them, compiled again and boom, my map went fullbright, I thought I forgot to check the light entities on the visgroups window, but they were included in the compile, I checked if VRAD didn't crash during compiling, it didn't happen either, I tried typing sv_cheats 1 and then mat_fullbright 0, It didn't work, mat_fullbright is set to 1 instantly, it's like setting its value to 0 doesn't even work. I created a thread on Steam's TF2 Forums, I tried everything but all of my singleplayer games are still fullbright, when I join a multiplayer server my lighting is ok, but singleplayer is completely fullbright. Is it possible for Hammer to eff up your game's graphical settings? How can I fix this? Example of this issue by loading Gravel Pit on singleplayer.