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					Originally Posted by  kovidgoyal
					 
				 
				@Perkin: All non-XML entities are replaced by their unicode equivalents. So   is replaced by the unicode non-breaking space character. This is syntax highlighted so you can see the space is not normal easily (it gets a different background color. The same goes for non-breaking hyphens. 
 
Entity replacements is needed since the XML processing pipeline calibre uses requires it (rewriting it to not replace entities would be too much work). 
 
@BR: The old tweak book feature still exists, go to Preferences->Toolbars and add unpack book to access it. 
			
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 Kovid, the Keyboard shortcuts menu still has the Label 
Tweak Books