Hello Pat i have a NW-E505 and i also use a mac osx and i have been thru hell. i cant use sonicstage and i have all old songs stuck on my mp3 player. i downloaded your file manager and it works on my mac osx but i cant seem to put any songs on the player. it wont delete or add anything so iam stuck. i do have the omg files and i have some java 10 i believe so i dont know what the problem is. do you think you could help me im in need of rescue thank you Cwebb