Where? After the video in caer lem, when the doors open in the first visit.
As soon as the video ends and the doors open, the screen should change, but I get a black screen (only see the mouse arrow, and hear the music).
There is no way to solve this.
I am running this on a MacBook pro with Big Sur (11.2.2) M1 chip with 8 GB memory.
This is a fresh saved game, I bought it and installed it yesterday