Hi
I have the same problem with an european LS Live 500last updated !
I'm french and my wife is Brazilian. So a lot of my mp3 collection are Frenchand Brazilian and I need verify all MP3 filename before upload to my LS.
The unique way to find a problem is to be connected with ftp and verify each directory and each filename !!!
All accentuation french or Brazilan (Spanish too) disturbe the internal filesystem but NOT samba ;)
Please Buffalo developper,produce a good and final firmware for this vice and the DLNA server which accept a too less number of file (10k) :-(