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I use Mac OS Sierra 10.12.1 on iMac 21,5 pouces, fin 2013 processor 3,1 GHz Intel Core i7 memory 16 Go 1600 MHz DDR3 but no problems with Mac Sierra...

OK, do you have any information about my problem ?

Yes, I use only mp3 format. If I have understood, it is impossible to solve the problem ?

OK: I tried 'Tag Editor' (Apple store) and the same problem appears ! But thank you for assistance.