Whenever I enable it via console, when a headcrab latches onto me my screen goes pink and black until I get the headcrab off!
This feature was cut, so it’s quite possible it’s not intended to be used and is buggy. I doubt anyone will fix this, even though they said it will be possible to enable it via cvars.
bump as I really wanted this
If you knew which file is used or where it should be located, you could try to make your own (don’t know about the file type, though) and somehow link it using a .res file, so the game actually uses it, instead of the pink & black checkerboard overlay.
Possibly a consequence of the script the devs used to clear the mod of unused files.