Bug with frozen game
I was bouncing around various rooms along the way in Quest 16. In the west corridor on floor 3 I entered the classroom in the training area (the naked girl) and Hermione stopped moving (reproducible).
For people who don't want to save all the time or don't think about it regularly in the game flow, it might be an idea to set up an autosave every 5-10min.
next bug
Quest 17: Flying with the broom on the way to Peeves without panties leads to a game breaking bug, because an image is not loaded: prt_sasha.png
It is no longer possible to leave the courtyard.
While there seems to be a lot to discover, you should probably try to play this game with blinders on. A pity.
