1st. Have you embedded the Lyrics in the files?
2nd. What are you trying to display the lyrics on ? Hardware / App etc??
I have no problems viewing lyrics on any devices I play the music on that are capable of displaying the Lyrics.
So I can view lyrics in 'JRemote' and most other apps on my iphone.
I haven't tried but I don't think I would be able to display lyrics if I were looking at my Yamaha Receiver, Panasonic Blu-Ray or Sony Blu-Ray DLNA devices because I have never seen an option on those to display any lyrics.
Carl