I have an iPhone4...still waiting fro my iPhone6.
My iPhone wouldn't sync with the new iTunes update for iOS 8, no matter what I did. I tried to "check" sync over wi-fi. "uncheck" sync over wi-fi.....blah blah blah. And that never resolved the issues.
My 2nd gen iPad2 wouldn't sync either. I have been on a rampage for the last week to find out why and nobody's suggestions resolved the issue.
My devices sync'd just fine before the update.
And I noticed that the new album art was't being saved, after the iOS 8 update, because the artwork was gone when I re-opened the app.
I fixed it on my system, I hope this will help everyone.
I searched for iTunes 10 and found that it was was available from Apple. So I went into the finder, clicked on "Go", then selected "applications", found iTunes, and threw it right into the trash bin.
Then I downloaded iTunes 10 and attempted to install it. "Attempted" because it didn't work. I was prompted that there was an update. So I let it update back and guess what...it updated to 11.4.😐
So I opened iTunes and clicked on sync.............and it sync'd🙂.