IPhone 4 trouble with iTunes

Once I did the update after it was released everything was fine, since updating my iTunes library with new music from my Mac and after the new iTunes update (11.1) my iPhone is not letting me listen to songs that were already on there, there's just a small stop pink sign near the song on the phone.

Also, the new music I downloaded would not sync to my iPhone even though it plays on the Mac, there's a small circle near the newly downloaded songs and it is highlighted in grey on my Mac. I even downloaded the new Mavericks OS update for my Mac and there's hardly any difference.

My podcasts, too don't work, it just says that playback has failed.

I really hope Apple fixes this as the majority of iPhone users have the iPhone 4/4s and this is a huge problem. I have looked at forums on the Apple website and some suggestions were to reset the iPhone completely but I really can't do that at the moment as it is time consuming to put the stuff back on, I think I'll wait to see if Apple get off their arses and fix this.

Any help appreciated, thanks.

Why the hell do you have an iPhone 4!

Make new account.

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