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			If it's any help, I noticed that the tables that get ruined are the ones with several columns.  In my experience, 6 columns won't work, but 2 or 3 are OK.  I don't know where the cutoff point is. 
 
Also, the problem occurs not just with conversion but also with Edit and Unpack.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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