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			 Junior Member 
			
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				no toc in viewer in v 4.0, 4.1
			 
			
			
			I run Calibre on a Windows 10 computer.  When I tried to upgrade to v 4.1 from v 3.x, I found that the viewer first loaded with an unreadable font.  After it loaded, I could read the book, but there was no table of contents sidebar.  I tried 4.0 instead, and found the same behavior.  I've downgraded to v.3.8 and everything is working again, but I'm at a loss to explain the problem.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#2 | 
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			 creator of calibre 
			
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			If you want to see the toc, press esc and click on Table of Contents. Or press ctrl+t
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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