Sorry. Can't help you with this..but I know what you mean about a film driving you nuts. I remember many years ago being scared by a B&W film and all I can remember about it is the back of a girl's head as she walks through large double doors (which had small round windows in them....like the old doors you found in hospitals).
I've been searching for this movie for years and - after many false dawns - I'm still no nearer to finding it.
