Hi there! We heard about this problem only once before you, when Runes were gone. Unfortunately, we can not track this problem and can not reproduce it on our hardware. Because its an WebGL build, there may be many factors. Runes reappear when you re enter the room a couple of times, but again, this problem appears on 1 out of 50 PC's and we can't understand what causes it.
Sorry for it, hope you could at least enjoy the idea and atmosphere of the game.