iPhone 5 with Apple adaptor worked fine before but since then have noticed when connected via the cable the song tracks don't correspond to the display.
It's fine on Bluetooth - only when connected via the cable the problem appears.
Not upgraded yet, but I will be getting a new phone soon (iPhone 5s) and I will let you know what I find out! Currently still using iOS6.1 on my iphone 4, and I have this problem with the RCD510 anyway
I used to have a similar situation with iOS 6 that the track playing was out of sync with that displayed. Only happened occasionally though. That's using an iPhone 4.
Try flipping the adaptor over. It does make a difference with IOS7.
With my third party adaptor one way round it discharges my phone. The other way it charges it. But IOS7 doesn't like third party chargers / adaptors and won't work at all with some. With mine if just gives a warning about compatibility.
Options: Truffel Leather, 19" Wheels, DVD Sat Nav, Xenon Lights, Bluetooth Phone, Parking Sensors, Drivers Electric Seat, Electric Fold-able Mirrors, Winter Pack, Hill Hold, Flat Tyre Indicator - added VW Racing Springs, and changed Bluetooth to newer model.
Works a treat here too... What unit is it? RNS/RCD and if RNS firmware are you using?
I've recently been playing around with a 'Tune2Air' as well, which plugs into the MDI and gives full connectivity over bluetooth as if it was connected via the dock... works really well with the VW entertainment systems but I think its more aimed at Audi's where they don't support a2dp streaming.
IOS7 destroyed my playlists and album order so I'm guessing it's done the same for you. Delete and re install on your computer that holds the main iTunes account and it should sort it out.