I've noticed that the line spacing (and in one case, the margin controls) hasn't been working in the last couple of books that I've purchased from B&N. No matter which of the line spacing settings I select, it continues to use the overly-tight default spacing. VERY hard for me to read.
The addition of controls like line spacing was the reason why I jumped from Apple's iBooks to B&N's nook eReader.
Is this a problem with the way that the publisher created the eBook?