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					Originally Posted by  theducks
					 
				 
				Publishers styling is a Device feature. It means use the CSS  
Some devices that is All or Not-a-thing used switch. Some allow some CSS control on top of the devices. 
Calibre's viewer allows your choice for DEFAULT generic font classes (image) lik serif...  That are used if any other font called is unavailable. eg  font-family: "Rickety Old Typewriter", monospaced;  As you may have observed, many  cleaning tools fail once a document has become  corrupted by a partial removal of intertwined elements.  
			
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 I don't see any feature for Publishers styling, or a similar phrasing, on my Nook GL3 or as an option under the Nook reader (I'm using the stock Nook reader app)...
As for cleaning tools malfunctioning: using Convert to clean up the unwanted 
font-family: serif; elements 
even when I have not tried to do so manually still does not work. The problem still only affects files that I have previously opened with CC.