... after a while of idling (maybe other conditions matter too). maybe 15 minutes, maybe more, maybe less. i ran into this several times now.
going to previous room works, it is only going to next room(right cursor or D) that stops working.
i play in window mode. i can also fix this bug by minimizing and restoring the window, so as of now this is a mild inconvenience but i thought it might be worth mentioning.