I have had incomplete sync of my musics and videos for quite a while, not just recently. it looks like it is related to the memoy management issue on the device.
here is what usually works for me:
(1) uncheck all playlists in itunes
(2) sync up your device and all musics and videos will be gone from the device
(3) check again the playlists that you want to sync
(4) USUALLY (this is a caveat) this solves the problem. all music files that you have on your playlist will show up on the device. BUT sometimes you need to repeat this once more before the issue goes away.
It is nice to find a "WORK AROUND" for this issue, but this is becoming a nuisance to me. As one of the most innovative tech company, Apple should have flawless execution for frequent task such as SYNCHRONIZING".
Steve Job was once kicked out from the company and i remember at that time the Apple Macintosh OS really really *****. I regretted buying 120 PowerMac at that time since the system application that I intended to use failed due to OS issue. Is this issue with software creeping up again?
To me, seeing so many users complained about SYNC task on itunes should be a REAL BIG RED FLAG! that the software wasnt properly written/tested. come on guys, can this simple and frequent task be fixed once and for all?
I tried to be objective in this post. sorry if the message is a bit harsh, but i think i am not the only frustrated user here in this Apple universe.