'Next' button missing from chapter 4

[classicdrogn]

Hm, the only two songs I can think of that specifically apply to ghosts don't work for multiple other reasons (Nightwish's Ghost Love Score has no lyrics, Little Ghost by the White Stripes has no accompaniment, both are inappropriate between a professor and a student even if he wasn't married) but I'm sure there must be something. Well, the Ghostbusters theme I suppose, but that's a little too confrontational. I doubt the scene would be causing such a problem if it was something that simple, anyway.