while both LineDef action...
14448
locked door
walk over once
open only
fast
red keycard
keycard <> skullkey
14576
dito but BLUE keycard
are working as they should, but:
144512
dito but YELLOW keycard
activates with/without any and all keys

uhm... i haven't tested, but... do locked doors always open if their corresponding key isn't present in the level???