Second iPod Touch 4th generation won't auto-sync music
Mac OS 10.6.8 - iTunes 11.4.
I have a 4th generation iPod, which has 6.1.3 OS on it. It is set to auto-sync checked songs, which it does.
I bought a "back up" iPod, which has 6.1.6 OS on it. It is also set to auto-sync checked songs, which it won't.
When I plug in the 6.1.6 iPod - the iTunes progress bar runs through the 6 steps real quickly, then goes idle - no music is moved to the iPod.
Watching the progress bar very closely, it looks like it actually skips step number 4.
Thanks for any help.
iPod touch