I'm playing BoUT2 on my Mac (bought from GOG) running Yosemite. I'm at the chapter in the castle. When I try to go down the stairs, I enter a dark room and find a note with directions on how to get through the crypts safely.
However, when Wilbur finishes reading the note, the "cutscene" never ends and I just get stuck. I can't continue on or do anything because the cursor never changes back from the >| arrow.
I've attached a savegame file from just before I enter the crypt.