I'm on the 64bit chromium version of gmod on a mac. Whenever I load into a map, it hijacks my UI and makes it ridiculously bright. It still persists after disconnecting the game, and I can temporarily fix it by running GmodPatchTool or exiting, but it'll continue after I load into and exit a map. It also effects my in-game ui and probably some parts of my game(?)
I'm not sure if it's an addon related issue. I have improved cubemap, source shadows, and Modern Shadows installed which could be the issue?