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					Originally Posted by  judsal
					 
				 
				There are also 3 metadata files:  
 
1) metadata [conflicted].db 
2) metadata_db_prefs_backup.json 
3) metadata_pre_restore.db 
			
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 That first file is supposed to be 'metadata.db'. The fact that it isn't called that is the reason Calibre thinks there is no library in that directory. 
The '[conficted]' bit makes me think there is some backup/sync/cloud drive program messing with your library. You being on a Mac, Time Machine maybe? Anyway, kill that, whatever it is.