Tried converting some new books as usual in version 4.19.0 but it gave info I didnt understand and wouldnt let me do anything 
Wish I had taken a screenshot! 
 
So went back to an earlier calibre which is working fine 
But am unsure if to update again. 
Has nobody else had this problem? 
 
Do love Calibre, its a great program.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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