I recently upgraded from Tiger to Leopard and all looked good until I tried to sync my ipod. A message appeared saying that I did not have enough access privileges to write to my music folder and that's where the fun began. After trying all the permission commands that I found on the apple support site and restoring my ipod with another computer because mine wouldn't let me, I still was not getting anywhere. I resigned myself to the fact that I'd have to do a clean install for this problem to go away. So I bought a new external and swapped the hard drive in that for the internal hard drive in my macbook and installed leopard cleanly. Much to my dismay, the problem persists. At this point, I have an ipod that will sync with any other computer but mine and I can sync any other ipod to my computer. How does this make any sense? This problem has stumped two apple geniuses who have no clue how to solve it and suggested buying a new ipod.