iPhone fiat 500 & iOS 7

Hi there,

I used to play my music in my car via USB in my blue&me it worked perfectly until I updated to ios7 and now it will not play at all, it charges the phone but no music through the sound system arghhhh HELP !!!! I even bought a new iPhone cable and still nothing :( Radio is doing my head in !!!!! Any help would be much appreciated. iPhone 5