Since updating itunes to 10.6.3 my playlists no longer sync to my iphone 4, any ideas how to rectify this?

Question

The playlists still show in itunes on my pc but they no longer show up on my iphone.  Well one of them does, but a Christmas playlist isn't going to do me much good at this time of year ;D

Answer 1

I'm sorry I didn't post back earlier, I haven't been using my VPN lately. However, today, I did use it for hours and the problem persisted exactly as explained. I did some more searching and found the following solution on a similar thread. Worked like a charm:
the vpn daemon has to be restarted. after that it works perfectly.
1. Open Terminal
2. Unload the VPN daemon using the following command (for those who don't know, don't include the % sign when typing in Terminal):
% sudo launchctl unload /System/Library/LaunchDaemons/com.apple.racoon.plist
Note: After you type the command in, Terminal will give you a warning and ask you if you want to continue. Enter your password and continue.
3. Reload the VPN daemon in Terminal (again, not typing the % sign) :
% sudo launchctl load /System/Library/LaunchDaemons/com.apple.racoon.plist
That should do it! Thank you to everyone who tried to help me. Hopefully this helps others out there...
P.S. For those that are unfamiliar with terminal. When you type in the commands, that's not a hard return in there before the path /System/Library... etc. The line break is just because the path is too long to fit on that line.
See the other person's VPN problem thread here:
https://discussions.apple.com/thread/3173994?start=0&tstart=0